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I can tell you right now it's your distributor, I JUST did the external coil mod yesterday to fix almost the exact same problem and now it runs perfectly.

P.S. Keeping the car below 3000rpm didnt work for me, infact it made it worse (just some food for thought)

Without wanting to be rude, you need to do a search. That information was just posted recently. Here's a link to a post re: HEI modding. http://www.mx-3.com/phpBB3/viewtopic.php?f=15&t=65143" onclick="window.open(this.href);return false;