I've noticed at a stop light it feels as if the engine is misfiring. At wot in third gear the truck seams to have a small feeling of pulling hard then letting off a little then pulling hard again. This has only happened this winter. I have a pulley, chip(street program), and trans valve body, also a single blade throttle body. I replaced the fuel filter 6000 miles ago. I also have Denso t22 spark plugs. Anyone ever have this happen to them.

 

yes, but in more of a drastic symptom, truck seems to idle with a small misfire but under any load, taking off or cruising a 45 and above, it would have a horrable bogging, it never threw a code, but just fell on its face under a load, turned out to be water in the spark plug holes, i pulled the coils to see if water was present and didnt see any but when i pulled the plugs the socket part of some were rusted, so i put in new plugs cleaned the coil packs really good and blew them out with air compressor and been fine....


jim

 

could this be a bad coil-pack?
Vinnie had a couple bad ones and I think thats what he explained what was happening. Maybe he will chime in.