Into a 2001 GMC 1500

My truck doesn't have a 4.3 vortex but the blazer does

It will run ok on flat land. It seems to shift ok when in town. But if you throttle it to pass or climb hill, it falls and acts like it is braking and downshifts.

it drives fine until i can hear the engine get to about thrd gear when the truck wants to get to about thirty miles an hour and then it idels super high and i have to throw it into tow and haul to get enough power out of it to get up to speed, but it doesnt stay there? Ive seen a couple Q and A"s that have said some thing about vacuum seal leaks and i do have a leak as well...please help

I need to smog my truck in California and I have to incomplete monitors. 1 is Evap and the other is secondary air. I can't figure out what my issue's are.

It still has a slight leak. What else could be the problem?

Engine starts up and holds 60 pounds of oil pressure for about 15 minutes then drops all pressure. I can turn the engine off and sit for 5 minutes then restart and it's does the same thing

air doesnot blow out of the vents on the dashboard only blows out of the vents on the side of the dash board and the console. its cold though.i want to know why it is not coming out of the dashboard,

It only stayed on for a second and when right off, and hasn't been on since. I was switching from 4WD...to LO...to HIGH to see if the light would come on, but it has not displayed again. Wondering if I have anything to worry about. My truck is a 2001 with 120,000 miles...but it is in MINT condition. Any advice would be helpful! Thank you in advance!

my 6 month old 4L60 trany (still under warranty) acts as though it's slipping going into 2nd. It does not do it from a stop. Only when I slow down below 20mph then accelerate. I contacted the manufacturer and they said check the MAF. After further examination I discovered 4 codes have been set off. P0171, P0174, P0300, & P0332. After researching these I've come to realize there's more to it than the MAF. From what I can see the MAF is clean and good. Unless there's a problem in female end of the connector. I don't have the money nor time to just start replacing parts. Where should I start in order to fix the shift issue so I do not ruin my brand new trany and potentially void the warranty?

the fuel pump continue to release gas into the motor, over flooding the spark plug with gas and the piston chambers with gas when the truck is turn of within a certain amount of time. ( for instance when sitting over night or a day without restarting the truck. email me at leespike38@gmail.com.

Motor has no oil pressure

When I'm accelerating it bogs out at 45 mph ideas on what to do?

First flushed the heater core and changed the thermostat heat worked for a few hours then stopped.. Just a bit ago changed filters and circuit board worked for an hour! All doors are opening as should it's just blowing cold Both hoses are also hot