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Discussion Starter · #1 ·
Hey guys. I need some help here. I've had a low rpm stumble in my '90 Grand Marquis 5.0 for a while now and it's really starting to get on my nerves. I've changed the plugs and the fuel filter assembly. Can anybody else offer a few other suggestions as to what it could be? For the record, the car is bone stock with the exception of ripping off the cat and it has about 155k miles. The stumble only happens when the revs are low, cruising around town. Not noticeable on the highway or under hard acceleration. Any help is very much appreciated. Thank you!

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Mark VII Member
47 Posts
Well ,I do not have a car like yours.But, I read on a different forem that when you have a problem like this you need to clean your IAB. I think that is somewhere before your throttel body. Possably on the plastic intake part. As I said I don't know for sure I just thought I'd let you in on what I heard.
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