1987 - 1996 F150 & Larger F-Series Trucks1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks
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I am struggling with sorting this as EGR problem or TC problem. The shop threw in some anti-slip but no change. For me, it's when rolling into the throttle at highway cruising speeds. I've taken mine apart and cleaned it thoroughly so next I am going to try a vacuum test on my system to see if I have a leak. I'll also try this test to see if it's TC or engine, really hard to tell.
If you have a misfire in one or more cylinders it will do this, also. A weak spark in a low RPM/rich-mid to heavy throttle condition will not fire properly. A plug can have a blazing blue spark out in the open air but put in under compression and it will fail. Coils, wires, and PIPs too. A cracked plug will do this. A cracked cap will do this.
I'm not saying the parts already replaced are bad, but who knows?
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