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There is no check engine light, and the only codes I see is 12 and 55 (nothing abnormal). I don't have a scanner to check other codes. As far as lifting off the throttle, it happens all the time, but appears more noticable at higher RPM's and speed. Above 2000 RPMS and 60+MPH, as RPMS drop to...

5.2L engine "bogs" ...here's the senerio, most noticable at 60+ mph, taching approx. 2000 rpm, lift off accelerator, and rpms drop to 1750 then engine bogs and rpms drop instantly to 1250 then rpms jump back to approx. 1700, and all is fine. This only appears to happen when rpms are...