Gmc 94 sonoma

Is the check engine light on ?
If not, it could be a faulty thermostat that is not letting the engine warm up.

rev limiter at what rpm are you doing for the shift light to come on ----your over revving the engine to high and the truck kills power if its doing at regular rpm then possible faulty limiter in 98 they removed the limiter and put a speed limiter 94 mph and the pcm would needed to be programmed or to remove it same thing
Easiest Way To Remove Rev Limiter

2000 GMC S15/T15 Sonoma P/U 4.3 liter V-6 VIN "X"
and
2000 GMC S15/T15 Sonoma P/U 4.3 liter V-6 VIN "W"





Hope helps (remember to rate this answer).

try fuelfilter and check the fuel psi it maybe fuelpump.goodluck

Hey there..this is very little information that you have given..and i would like to help you...but if its stuck in 4 wheel low..you probably have something wrong inside your 4 wheel drive transfer case or a linkage problem..please write me back with more details

i have had the same problem and i found that it was the fuel pump causing the problem

When was the last time the fuel filter was chg.? If thats not an issue best to get a fuel pressure test.

Hi Terrie- You can go to '94 GMC Somoma Repair' and there are numerous sites. But I think you have to remove the 4 prong wire (may have to wait for entire unit before removing red lead?) and crossmember (only 4 bolts?) and/or then loosen 1 bolt then remove other-thenstand it up and turn around before you slide out and down. Not that big-o-deal but it helps to know before you go in(you can call |GMC and ask Service Dept. Good luck and God bless
Steve

no real pit falls just drain coolant remove head have head checked at machine shop. Clean engine surface good and rise good with brake clean, make sure head gasket is on correct before head goes on bolt down with proper torque and sequence then finish up then drain oil.

check for clogged catalytic converter