above car not behaving,when cold accelerates perfect but when warmed up and you accelerate over 3000 revs the car has a slight vibration which sounds like its coming from the exhaust as if too much gases going through it. Went up a hill the other day and it struggled to get up it had to change to 2nd gear as my foot was flat to floor and nothing. had chains all new, new coil packs , new alternator full service ne w plugs , but when warm has problems accelerating over 3000 revs just doesnt run smooth at moment any ideas please would be grateful at this time. thanks.