GMC 1500 Pickup Questions

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I switched out the ignition key cylinder on my truck. Now, due to the anti theft system, I am unable to start my truck. I have followed every step in the relearn procedure but I am still unable to start my truck. After trying to start the truck (and it dies), I leave the key on the "on" position however, the "Security" light only flashes three times and turns off. It does not turn back on or flash or anything after the 10 minutes (where the light should have remained on and then turned off) and I have tried this multiple times but the light will not stay on. Any advice?

It ran fine when I parked it, about a month ago. Put the new battery in today, and it won't run. It starts, but will not run long - 3 to 5 sec then dies

Would replacing the module be a straight forward fix?

my mechanic said it not fuel pump

I filled up my gas tank too full I usually only keep it a quarter.
The next day it would not start replaced fuel pump fuel filter plugs wires distributor and module started up ok but when I put it in gear engine shakes rattles low-power stalls out

Ever time I drive it any in all gears

I've replaced the TPS plugs wires fuel filter fuel pressure regulator and cleaned the throttle body. It's still running horrible. Does not want to idle in the morning, it will run for about 10 seconds then die. When I finally take off it will fall on its face and back fire, even if I hold it to the floor it'll do nothing, then all at once it'll accelerate like mad then start back firing and stalling. Could it be the EGR or O2 sensor or both

I have to try & fix money but need truck

4.3 V6 automatic trans

highway mileage is bad. engine runs strong and does not use oil.

Ok here is my store. Have had the truck for 15 year. Daliy driver. Stopped driving it about a year ago. Only on the weekend. 6 months ago I put in a new starter and a new distributor due to it blowing ignition fuses. 2 month ago. I had to jump it to get to work. Got to work and it would not start again. The battery was old and not holding a charge. So it stat still for about a month. Just got a new battery but now it won't turn over. I did a tune up on it just to make sure but still won't turn over. I checked the coil and plugs for spark and it dose have spark. It has gas(half tank). I can smell and see fuel in the throttle body so fuel is getting to the injecters. But still won't turn over. It wants to but doesn't. Any ideas or area to look at. Also I do have a msd ignition on the truck.

I checkd fuses but radio want power on light on. Radio is out & no sound but the eject button if pushed makes sum kind of racket liket its getn power

Also left window not working & gauges action funy

new plugs wires new coil new fuel pump assymbly

Truck failed emission test at the smog. I replaced the rotor cap, spark plugs ect. But still has a problem. Put a new Egr in. Nothing changed. Truck has a crack before the o2 sensor, timing is off by 10 points. Was wondering why im still having a problem trying to pass smog. The smog people told me that my car is burning "Rich".

I have changed the bulbs taillight bulb board and nothing. When I turn on the left blinker it blinks double and the reverse light on the right side blinks. Is my problem in the swicth or where?

Did tune up. Checked fuel. Everything is good just won't start


Was blowing the fuse when using the left side turn signal. Replaced all the bulbs. Now blows the fuse when using the right side turn signal but not the left??

This light just came on. I keep my vehicle upkeep right on schedule. Does this mean I need new brakes, rotar. Also, IS IT SAFE TO DRIVE?

My gauges are not reading right and it loses power if I run any accessories. Its not the alternator or fuses.

when Gona drive off frm the stop wants to shut off,runs good on a kind run.just when coming to a stop.

80% of time

The truck dies a lot in the summer. It just dies.

what is aradio battery

I have a 1998 gmc sierra and both the inside and outside handles are broke and cannot get the door open and I have part of the inside panel off i pull the bar that goes to the latch but fell like it is broke or dissconnected

Occurs daily once truck is warm. Doesn't happen when it's cold or short distances. Stops squealing at about 1500 RPM.

Throttle Foot pedal goes to the floor and springs back with no problem. Removed the air cleaner and throttle works like it should.

No voltage from the signal wire. Help Brad