Hi everybody! I recently started noticing a significant loss of power on my 1987 Volvo 740 GL. Moreover, it's misfiring when cold, especially if I don't warm up the engine for at least 10 min.: sometimes I can even hear like a small gunshot from the driver side. When up the hill (or under load) the RPMs slow dramatically, and the engine gets really hot (without warning lights)! I went to the dealer and spent 80$ to find out that it's probably the AMM (air flow meter, or air mass meter), combined with a faulty fuel pump. I know that this AMM costs usually something around 200$. Could anyone tell me if experienced the same problem and if replacing the AMM (and eventually the fuel pump)will resolve it? Or mybe I should consider replacing other parts as well, like the FPR (fuel pressure regulator) or else. THANK YOU VERY MUCH for your help.

Lis