m42 hesitating

[falo]

hi there im new to the forum so please go easy on me i recently swapped an m42 into my e30 and im now having some problems with hesitating in the lower rev range but after 3500rpm it goes like the clappers also got abit of a lumpy idle before i fitted the engine i done the head gasket and done all the mess under the inlet manifold all new gaskets on the inlet. the bits i have done while trying to work out why shes hesitating ive swapped afm swapped tps new cam sensor checked timing swapped fpr also done the cop conversion to which none of these made any diffrence ive got no codes coming up on my snapon code reader im abit stumped on where to go next ?? could it be dripping injectors? also could anyone tell me what the fuel pressure is supposed to be at idle? mine is sitting below 40psi at idle


if anyone could shed some light on where to go next it would be very much appreciated
cheers Olaf