hey y'all newish to here. i have read multiple threads from here with some great help and guidance. i have a 94 e320 3.2l. i recently changed the plugs wires coils and maf due to a bad idle/misfire. maf seemed to help the misfire/idle. my car still wont go passed 3k rpms i have the code reader and have read and deleted the codes a few days ago with no luck of anything changing. when i first got the car it ran flawlessly. now it wont go passed 3k in drive. in park/neutral it revs perfectly but has no get up to her anymore. i have a o2 sensor on the way. broken vac line im gonna fix tomorrow. after replacing maf today the cat was making a rattling/knocking sound. cat has been replaced and is barely a month old. could it be a bad cat? plugged fuel filter? bad fuel regulator? renaissance valve? throttle body? (have a used one out of 95) can anyone point me in the right direction? any help is greatly appreciated!!!