Iv had the m52 in for a couple of weeks now, it still feels quick but i think its misfiring especially at low rpm, the car seems to be really jerky at low rpm (i dont mean so low that i need to gear down) like its not firing properly on all cylinders, its really sounds like the engine is unwell, it gargles and pops all the time when i slow down, im not sure if its because of the stainless backbox, one thing is though, my car is OBD2 and i bought a centre pipe off a OBD1 1992 325, i have plugged in the two lambda sensors that come off the headers, but thats all i can see, there is a lambda sensor on the centre pipe but there is no more plugs on the engine loom to plug in an extra lambda, is there only one the two lambdas on a 328? could the engine have high milage have anything to do with it? if anyone knows what it could be please help | 
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