I have a 1989 Ford Mustang 5.0 with the tremec 5 speed tranny. I just upgraded my engine to a 331 stroker kit. It has everything new. I spent about $2400 in parts and labor. I put a Crane 282 Cam, Mahle Pistons, and Eagled Crank. I have new roller lifters, and Crane timin set. New water pump. Electric fan, 130 volt alternator. and the damn car has a rough idle when cold and hot, and it overheats a lil past three quaters. I've changed the ECT, ACT sensors. I've adjusted the timing. However, does anyone know if the ignition timing should be changed since I added a 331 stroker kit?? Any ideas as to what could be gong wrong. Thanks
Help!!! Car idle is rough and It overheats!
- Thread starter mixael-17
- Start date
That is a good timing question. I just fired up my 347. I have a flex a lite fan. 3 core aluminum radiator. And it runs around 190 to 200. My fan stay on after it warms up. It seems to like a little more timing. I have it set at 14 right now on my car. I havent drien it yet because I still am adjusting some things and it started to poor outside. It seems that our cars might like more timing. Anyone?
You guys with idle problems could save a lot of time chasing your tails if you would go through the Surging Idle Checklist. Over 50 different people contributed information to it. The first post has all the fixes, and steps through the how to find and fix you idle problems without spending a lot of time and money. I continue to update it as more people post fixes or ask questions. You can post questions to that sticky and have your name and idle problem recognized. The guys with original problems and fixes get their posts added to the main fix! 
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