i found the problem w/ my car...
#2
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maybe your timing belt is off by a few teeth. That advanced or retarded timing would be enough to do it but it would be a rough ride I would think and you would notice it right after the belt change.
#4
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timming belt was done 15k ago but i am not sure if they did the new tensioner or not . is there any mod that can be done to the head since it needs to be redone? and how much $ i am wondering if it would be better to buy, mat from induction's motor??