i think he migth be talking about carbon build up on the valves, not in the cylinders. although i dont think an ignition would clean the valves either. i ran Run-Rite through my old 86 iroc. did a good job gettin al the build up off the valves.
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1990 IROC-Z - L98 G92 and some go fast goodies
1999 Blazer - ZR2 and some off road goodies
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