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?
"Failure is the opportunity to begin again more intelligently." Henry Ford
1989 F250 460 C6 D60 front 10 1/4 rear 3.55
1990 F150 300 4R70W, 2004 Silverado 5.3
1982 IH S2500 400 Cummins 13spd
1994 CAT 953B 3116 Hydrostat
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