Motor swap issues
#1
Motor swap issues
I just recently bought a 2001 Audi A4 Quattro, but it has an engine swap. It now has a 4.2 from an 2002 Audi A6 I believe. It has an ideling issue revs real high then drops back down and constantly does this. Can anyone help me out? Guy I bought it from says ECU, if that's the case which ecu should I use. He claims it because the engine was from an automatic and the car it's in now is a 5 speed...
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