1999 Chevrolet Silverado 1500 Questions

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when you shut it off to go to the store say30 min it wont come back till it sets overnight
does it need freon or is there something big time wrong.
Changed iss/oss sensor shafted great for couple days went back to sharfting bad
The truck won't go into togear and move it,four wheel drive
Wont come our of low lock indicator lights either all stay on or all off but is in 2wheel drive every time I get in it
4x4 selector shows 2 wheel drive when switch to 4 wheel high light flashes on dash. when i put it in 4 wheel low it comes on and stays on but can go back to 2 wheel drive. the front drive shaft will not turn in 2 wheel drive
code says service 4 wheel drive, no lights on selector switch
I was wondering if you guys could replace it under the safety recalls
Checked & changed fuses.moved wires .radio worked then changed wire again & won't stay on when engine running
We replaced the battery first then alternator n starter. Still does the same thing. Amp meter on dash don't show more than 13. Alternator is charging. Where are the ground straps located on a 99 silverado 1500 4x4 LT. 5.3 L. I'm stumped. Unstump me please. Thanks
bulb was bad still no work put right side bulbs in left side they work?? Right side bulbs lite but do not blink green turn indicator on dash is lit
I just replaced a fuel pump in my truck, and within a week got a check engine light. Scan says error code P0171 & P0174, which shows bank 1 & 2 fuel system too lean. Could this error be related to my recent fuel pump replacement?
Never had this issue with the truck or any other vehicle before. While at idle in traffic, intermittently the engine will start to pulse between roughly 500 rpm's and nearly none. The pulsing will start off minimal but grow to the point that it will finally die. I can throw it into park and restart it no problem, but the pulsing continues. Otherwise I have no problems with the engine while driving. I have noticed that it only seems to do this when in gear, not when in park.
When the truck is put in reverse it stalls ocasionally it will stall at an idel
The new ICM had an orange wire installed with it as the old one did not
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