When I take the tuck out of park and put it into drive/reverse it starts to accelerate on its own getting up to 20-30 miles per hour. When I place it in park or neutral the RPMS shoot up to 3000 and hovers around there. When I start or turn off the engine now the entire truck shakes. Everything was fine last night and early this afternoon it started on my 15 min drive to work and has continued everytime I have started the truck since.
Clean your throttle body, IAC, and EGR valve.
I would recommend replacing the idle air control valve. Refer to any of the many YouTube videos on this subject and you shousl have no problem replacing it. It is availabe at Rock Auto, Parts Geek and most good local parts shops.
SOURCE: 1999 Gmc Sierra has no power
Sounds like the fuel supply is inadequate. Check for a plugged fuel filter, or possibly the fuel pump is losing pressure. I had a 93 Chevy V6 that acted the same way, and after checking everything else I replaced the fuel pump, which solved the problem.
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: vehicle hakes when driving 45 to 50 miles per hour
Check wheel balance,
check steering linkages for loosness - such as tie rod ends, steering rack linkages etc,
check driveline for worn/loose joints and bearings.
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