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Solved the second problem... I never would have guessed it, but it was a clogged catalytic converter. I had a heck of a time getting the sucker out, so I just unbolted the y-pipe from the exhaust manifold, and she ran like new. So if anyone has similar symptoms, check the cat! Thanks for all...

Problem Solved! Thank you all for your suggestions. I tried most of them, and as a last ditch effort before taking the truck to a dreaded garage, I unbolted the catalytic converter. A few people told me that my problem might be excessive back pressure due to a clogged cat. And sure...

Thanks for the quick reply EXPLODER-1. The engine actually idles fine, and the problem isn't apparent until I open the throttle...

I was trying to get my '88 GMC S-15 running (turns out the coil went bad), but now that I got it running the engine seriously lacks power, and there's a noise coming form the intake manifold that sounds like an exhaust pipe without a muffler. Also- and I might be imagining this- but I thought...

Thank you guys for your replys... It was the coil afterall! I tested the coil per Hayne's instructions, and it checked out, but I figured what the hell, I'll try a new one anyway. And it worked!!!

Bucking Problem Solved!!! Well Fellas, I solved the popping and bucking problem- It was the COIL ! I tested my old coil per Hayne's instructions, and it checked out fine, but I figured what the hell, I'll try a new one anyway. And it solved the problem! Unfortunatly I must have screwed up...

Seems I'm having exactly the same problem as Jake's Dad and others, only here's the clincher... It's my GMC Jimmy... Poor acceleration under load, weird knocking/popping sound from beyond the firewall, the more I try to accelerate the less the truck seems to want to, and it's worst when the...