First I thought it was a sticky tappet or something so I put some marvels magic oil stuff and hoped for the best, then I wondered if it could be a tiny blow from the manifold so we put it up on the ramps, three of the spark plugs on one bank had started to make their way off somewhere or other and were actually moving in and out of their sockets as the engine ran!!!
They are a real pain in the arse to get to in a 4th gen LT1 so I'm unsure if someone has attempted to change them at some point in a half hearted manner or they are the original's but it certainly goes a lot better now they have been tightened up
, I'll have to disconnect the ECU to reset it to the default map and let it begin the learning process again now they have been fixed, so I was running on about 6 cylinders worth of compression for the last year :-) , only the gearbox whine to deal with left now as I think I have been through everything else
