I get a vibration or shudder after tranny shifts into 4th gear and only between 55-60 mph, replaced u-joints, front driveshaft, and motor mounts but still does it. what else could cause that

I get a vibration or shudder after tranny shifts into 4th gear and only between 55-60 mph, replaced u-joints, front driveshaft, and motor mounts but still does it. what else could cause that 1 Answer

It starts fine, if I stay with it, negotiate the gas pedal for a few seconds it wil usually keep idling smoothly. Until I put it into gear? 3 Answers

(1995 GMC Sierra 2500 Pickup, 305 V8, Automatic Transmission, rear wheel drive, 85,000 miles) Once in gear it will normally require me lightly pumping the gas to keep from dying. Too much gas and it...

After 5mins or so I can't get above 3000 rpms, please help. 1 Answer

It starts up fine, runs like a brand new truck for a few minutes, then starts struggling. When it's struggling it won't go over 3000 RPM, when i try to force it over 3000 it'll start getting misfir...

I have a 1989 GMC Sierra 2500. within the past few weeks, my heater has started blowing cold air. But, it doesn't constantly blow cold air. It goes back and forth between hot and cold. Does this mean my heater core is bad, or may it be another problem? 3 Answers

I have a 1989 GMC Sierra 2500. within the past few weeks, my heater has started blowing cold air. But, it doesn't constantly blow cold air. It goes back and forth between hot and cold. Does this mean ...

Sierra Will crank but not start 1 Answer

My K2500 Sierra will crank but not start. I tested the fuel pump and it was not getting full pressure so I replaced it. After that it still won't start. I have replaced the fuel pump, filter, Igniti...