1995 gmc sierra automatic. When I accelerate to the floor it has no power but when I let off on the accelerator it seams to pick up speed. will not run faster than 65 or 70 mph. I put HEET in the fuel thinking i maybe got water in fuel tank but it should run bad all the time. what about fuel filter being almost plugged?

This is a scam! $12.00 was a cheap lesson, but I'll post my displeasure with every available site I can. If you don't know just say it, don't play this pass the buck game. Typical anymore. Thanks for nothing-mitch kelley6. This is a scam! $12.00 was a cheap lesson, but I'll post my displeasure with every available site I can. If you don't know just say it, don't play this pass the buck game. Typical anymore. Thanks for nothing-mitch kelley6.

Could be a number of things. I have a 93 GMC S15 and it has tbi fuel injection and the computer, a good idea is to get a code checker that plugs into the dash. Often will tell you what it thinks is wrong in electronic sensor system, flashes code on your dashboard, checker is about $24 at Kragen or AutoZone. Lot of people think fuel, it could be a misfiring cylinder or a really clogged air cleaner. If you have changed anything, like distributor timing, that might be first clue to follow. If also has fast idle could indicate vacuum leak which makes it run too lean (same effect) and have loss of power. Could be a number of things. I have a 93 GMC S15 and it has tbi fuel injection and the computer, a good idea is to get a code checker that plugs into the dash. Often will tell you what it thinks is wrong in electronic sensor system, flashes code on your dashboard, checker is about $24 at Kragen or AutoZone. Lot of people think fuel, it could be a misfiring cylinder or a really clogged air cleaner. If you have changed anything, like distributor timing, that might be first clue to follow. If also has fast idle could indicate vacuum leak which makes it run too lean (same effect) and have loss of power.

If it's been running good till now, I would first think that a vacuum hose has slipped off of s spigot somewhere, confirm everything with smog sensor hoses is connected using diagram sticker on fender well or such. Great truck, and ECM system is solid on mine. If it's been running good till now, I would first think that a vacuum hose has slipped off of s spigot somewhere, confirm everything with smog sensor hoses is connected using diagram sticker on fender well or such. Great truck, and ECM system is solid on mine.