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Originally Posted by chud
One thing on mine is when I lift up on the air filter assembly, the engine starts stumbling and stalls just like it does at idle sometimes. I don't think it should do that. Does yours do that to? Could somebody whose truck is running good tell me if theirs stalls when you lift up a little on the air filter plastic assembly? I don't even take the wingnuts off the top - just give it a little upward pressure and it starts running terribly and eventually stalls.
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I tried this with my truck, and got no change. I could not budge the air cleaner assembly without loosening the wingnuts. If you are able to lift up on the assembly, you are be allowing air into the throttle body which is not being measured by the Mass Air Flow sensor. This would definitely cause sputtering and stalling. I had a '91 Ford Escort GT which developed a crack in the corrugated flexible tube that connected the throttle body to the air box. Sometimes it would run perfectly fine, but then it would sputter and stall randomly. It was a pain to find, as it was on the underside of the tube, in the valley of one of the corrugations. I had to take it off the car, and spread each section to look for cracks.
That specific case is not a problem on our trucks because the Mass Air Flow sensor is contained in the air cleaner assembly. However, I would check for a tight seal around the throttle body. With my truck, I had to loosen the wingnuts and put significant force on the air cleaner to get a result.
Hope that is helpful.
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