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Registered
Join Date: Mar 2001
Location: Wallenstein, Ontario, Canada
Posts: 2,609
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Thom
We have a sort of similar problem with a 3.6 conversion I did on a friend's SC this past fall. The car occasionally starts hard and idles poorly/stalls with out giving it some gas. I have the check engine light hooked up and it comes on when this occurs. I have traced it to be the throttle cable solution that came with the kit. Basically if the thing is adjusted enough to get full opening of the throttle, occasionally it will hang up and not allow the throttle to return to the idle position and trip the idle micro switch.
Basically the throttle returns to the stop position, or appears to but at this positon there is very little spring tension to pull it fully closed and trip the switch.
The computer gets confused thinking the throttle is part open and negates the idle circut but obviously it isn't open far enough to keep the car running and you have the poor running problem.
Not sure if this is related to your problem but may be something to check. I think in our case it is complicated by the cruise cable that is used as the throttle cable having a slight kink and getting hung up even when the cable is loosened off.
Good Luck
Todd
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1989 911 Targa
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