HI Vobd, unfortunatelly i have done i guess most of that before but did not do any good ( 850 volvo 1994 B5225FS non turbo )


Well maybe this will be morehelpfull, when i was doing myself the complete almost rebuilt of engine ( new pistong, new rings, head rubuilt), i totally cleaned the ( black box - oil separator which has 3 vacum hoses) the flame trap too was cleaned, and the two lines going to the fuel relay and second to the pressure sensor), intake manifold was cleaned and polished too !!, but it really did not help, i had also cleaned the throtle body, and the IAC seems to work fine but the problem is still on, the only thing what i have not changed is the EVAP canister with 2 line to the throtle but that is suppose to be closed during idling, and give extra fuel 100 gr to be burned after 20 min, what do you think about the pressure sensor, or maybe the aic works but turns to slow ?