hi guys, my car was running real lumpy when cold so i changed the.

1. maf sensor
2. coil pack
3. coolant temp sensor

after changing the coolant temp sensor it ran like a dream for about 4-5 days and now AGAIN it is running really lumpy when cold, as soon as it warms up it fine.

the coil pack and the maf was second hand when i got them.

any idears what els it could be.

Thanks David

 

i took the car for a long drive to marewell zoo today and noticed that when its cold its realy lumpy and when its warm i thought that it was fine but i was wrong and its not.
even when warm it still hesitates and some times missfires, it also seems to be holding back quite a bit.

Thanks David

 

manifold / intercooler leak causing maf measured air to not enter the engine and the ecu injecting fuel for it.. therefore running rich

check intercooler pipes and vac lines