i'm having trouble diag. a drivabilty problem,87 irocz 5.7,car want idle at all,code 34 is stored,chilton serv . manual says that its a map sensor circuit.well this car don't have a map sensor,it has a mass airflow sensor.I don't see a diag flow chart for mass flow sensor.I have part swapped from my other cars and it's not the mass airflow,tps,iac,or the ecm.I believe it's a short or a vacuum leak that i cant seem to find.if any one has any info that will help me fix this problem please reply.