Have you done the grounding mod? That's the exact problem people are trying to solve by adding additional grounding. The basic idea is that with better grounds, the sensors will give better info to the ECU.
Check this out:
http://www.scoobymods.com/forums/sho...&threadid=1197
You prolly don't need a specific kit, as a trip to Radio Shack will get you the same stuff for way cheaper, as long as you have the tools/experience to cut and crimp wires.
There's a lot of discussion about wether or not the grounding mod does anything... I did mine and never noticed a thing... but after looking at the pathetic factory grounding, I figured I might as well throw a few extra wires in there... not a tough job.