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Originally Posted by paulfischer
I have a 99 LTZ with the 3.8. And I have the same problems as you do.
It might be the coil packs, or possibly dirty fuel injectors. Have you cleaned the throttle body out with with some carb cleaner??
I have been running seafoam cleaner through the system, and it seems to have improved a bit.. Was thinking of just having an injector cleaning done on it. and see what happens.
I live in Chicago, and the rumor is that the refomulated gas that we run in the summer months is hard on the injectors.
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Paulfischer you may be right. I'm thinking first try a single coil pak and try it out for awhile on each of the three locations. I guess the biggest problem to diagnosing this is that it is so intermittent. When you want it to act up it won't! I'm also thinking from the posts I've read that it may be the ignition control module....but I read here that when that begins to make trouble it simply won't run. Mine cranks fine and runs fine....but acts up on occassion....and even then it will crank and run....just rough...like not on all cylinders. Oh well...maybe we'll hear from some of these expert folks on here.