My 1996 GMC half ton 2wd revs up to about 2000 rpm on start up without touching the accelerator. After a few seconds, it goes back to normal. Also, when you put it into drive or reverse, it accelerates without touching the accelerator. I can drive all over town without touching the accelerator. It goes back to normal idle speed when you put it in neutral or park. What might be the problem?

SOURCE: 1996 Gmc Jimmy Acceleration

check our egr valve if vale open to fast to mush air create hesitation disconnect the egr and try it out when accelerating egr valve open to put extra air in engine to burn polution bad valve create hesitation engine noise hope it FIXYA our problem thanks pierre

SOURCE: 2000 GMC Jimmy slow acceleration until 3000 rpms

you could check the fuel pump i recently had some problems with my punp after i replaced it where i would get to 3k rpms and it would sorta shut down and wouldnt go past it untill i let off the pedal

SOURCE: Sluggish slow acceleration

Check that transmission fluid if its an automatic, should be full and clean, if manual trans clutch probably slipping

SOURCE: 1996 Yukon misfire when driving at steady speed

either your fuel filter by be plugged, could be injector shorting out could be throttle position sensor

SOURCE: 1995 GMC Safari Loses Power when accelerating hard, rough idle

your egr valve might be faulty bring it in to the auto parts to have it check out what your looking for is the 32 code on the OBD II scanner.