Thread: Fixing a dead miss on light load

No SES light?

Why not get new wires and plugs?? Perhaps they are just old and already need to be replaced.

I'm curious what year GP, must be 89-96. Stumbling in cruise mode is usually a vacuum leak or weak ignition, in that order and generally speaking. Try neatly routing the plug wires to see if the trouble goes away and maybe you can answer your own question.

If it was factory equipped with a getrag 5-speed, it would have to be a '93 or older. They took that option away from the w-bodies with the interior redesigns in '94.

As idrivejunk said, a miss under any kind of load is usually either a vacuum leak, or ignition issue. I don't think routing is a factor so long as the right wires/plugs are connected to the right coil pack terminals. If they haven't been done in a while, I'd change out the plugs and wires regardless. If it persists, I know they're a pain in the ass to get to, but I'd pull out the coils and look at them. When I first got my 2-door TGP, it would miss BAD and had 0 power if I went more than 1/4 throttle on it. Drove it like that for a while, and then during one of the local w-body meets, one of the members just happened to look at and noticed that all 3 coil cases were split open like nothing I'd ever seen before. Switched those and the ICM out with new GM take-offs I had picked up on eBay for pretty cheap, and no more problems.

Good to hear it was a simple fix! Plain old AC Delcos (no Rapidfires needed) or NGKs are more than sufficient. You are not going to gain even .5hp from the plugs, so no reason to splurge on them. Just OEM replacements with decent quality to them.