Good afternoon, I have a 2000 v6 3.8 Mustang and i have this problem with it. Its when i accelerate in low RPMs like near 1k - 1.5 the engine bay starts to bounce but when i give it more gas it stops and goes normaly. This bouncing does it only on drive or reverse and not on parked. I went to autozone and the cpu diagnosted a p0411 code so i went to a mechanic so it could diagnost it too and he said it was the EGR system he checked and saw a conecting tubing where the air or vacume something like that flows there that it was wrong and so he repair that tubing and the problem seem to do it less bounces so i changed the EGR valve to a new one but the bouncing still there so im planning to change the solenoid and the sensor, too. What advise can you give me? Oh and the check engine light doesnt show like if there was no problem! And now i am driving without a little cable tubing color green that goes conected in the EGR valve because when it is not connected the engine never bounces, is like if the problem is solved!