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Surging or pulsing when accelerating

5K views 5 replies 5 participants last post by  f8tlfiveo 
#1 ·
I notice a surging or pulsing with the engine and you can feel it in the car when I start out accelerating sometimes around 30, 40 to 50 miles an hour. No check engine light no codes. And then recently I was leaving town and Accelerated up and it set the cruise control and all the sudden I lost power and went down to limp mode. I was wondering if I might have a catalytic converter issue. Or is it something else?
 
#5 ·
I wonder if you have a bad ground connection that would make it seem like you’re tapping the brakes to knock it off cruise control. Our van had really bad hesitation when you hit the gas and it wouldn’t move. Then the rpm would surge and you’d still not move correspondingly. They traced it to a bad main ground that was not making a good connection. Interestingly it only happened on cold/wet conditions. Once it was tightened down, all was good.
 
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