Hello everyone, my tb42 efi idles good but as soon as you rev it up a bit it will start crackling and backfiring through exhaust . Has been retimed multiple times and is set to about 12 degrees BTDC . My tachometer also dances all over the place when revved I have changed CAS,MAF and both plugs going to them. Is there a reason behind this also has new ecu/injectors/fuel pump/plugs/leads/coil
Cheers