Hey Scotty,big fan you took me through my first steps of fixing cars! Super happy to found your channel! One big issue for my side: Peugeot 406 Coupe 2002,2.0 16v 136 bhp. Changed plugs,iginition coil,MAP sensor,Idle control valve,TPS almost everything,checked for vacumme leaks and cleaned the intake,new egr and so on. The car has LPG but it doesn't make a difference if drive on petrol or LPG problem is still there:
Random Hard starts,when the car idles, it stalls and misfires badly. When you hit the gas it accelerates superbly. I get codes P0403 Exhaust Gas Recirculation Circuit Malfunction, P0300 (Random Misfire) and P0170 Fuel Trim Malfunction (Bank 1). I went through all your videos maybe 10 times,nothing helps. Peugeot people say hyd.lifters need to be changed. Besides this car has superb compression 12/12.4/12/12.4. Any thought?