Quote:
Originally Posted by 90_ZR1
I just got my first ZR-1 (1990) last week and drove it for the first time this evening.
It doesn't idle too badly, but misfires badly when driving. My first question is what sparkplugs are recommended. I pulled one plug and it's an AC Delco 41-800. I saw another post where someone had 41-620's.
I would also like to know if the timing is adjustable, and what it should be if so.
Any advice appreciated.
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Timing change needs to be done by modifying the calibration.