When I have the car in park you can feel it a little bit, but once in drive you can really feel it. The needle on the tach. doesnt fludder around or anything. When taking off the roughness will slowly fade away, until about 40mph then it starts up again pretty bad, until about 45-50 mph. It also starts if there is load on the engine, like when coming to a stop then accelerating before the transmission down shifts. So far I put in a bottle of techron, changed the spark plugs and wires, changed the air and fuel filters, cleaned the maf and throttle body. I'm not the sure what to look at next. Oh and no codes are being thrown.