dscowell Posted July 8, 2017 Share Posted July 8, 2017 I was driving my truck and was having a lack of throttle response. I'd floor it and it would putter a long and want to speed up but couldn't. It sounded like at one point it was back firing but the sound was near the manifold not the cat. Pulled out of the way and turned my truck off. Started it back up and it had a terrible start idled at about 250rpms then shot up to 2000 then back down to 250. Didn't seem to be a timing or vacuum problem. Any ideas? 1990 4.0L Link to comment Share on other sites More sharing options...
dscowell Posted July 8, 2017 Author Share Posted July 8, 2017 Leak the brake booster. Problem solved. Link to comment Share on other sites More sharing options...
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