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Discussion Starter · #1 ·
so we found that a cat converter was the major culperit [and swaped it out ] bo wha a improvement .

how ever my question is whats going on at 2000 rpms because after a dead batery and i charged it ,i put it to 2000 rpms to max the altinator s charge to the batery [u probly know about that rpm test] any way WHEN i hold 2000 rpms it wants to break up like a plug wire or injector reaction .
other wise u cant tell anything is wrong regular driveing

so whats going on at 2000 rpms ???
ty for in put cosmo

1991 vert 77,000 miles
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