I like the fact that you can search for info on this board. This relates to an old posting, but the info sure helped me with my car. I bought a can of the top engine cleaner sold by GM, and it works. My 305 idles better, smoother, and responds much better. I ran it through last night. Hey, it pays to read. Thanks.
Jess

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Blue '86 IROC, 305 TPI
Ported Plenum, gutted air boxes, SuperChip, KN filters, TB Airfoil, transmission cooler... more to come. Not raced yet. 70,000 original miles. Owned since 1992.