I have a 1989 5.0 Convert with a AOd Trans. I blew my head gasket and have had the vehicle at the mechanic shop getting everything fixed back up. Mechanic bolts it all up and now tells me the car will not idle. I took the air intake off and found there was muddy looking oil in the intake. I have hot dipped the intake and butterfly. Car still will not idle. Car idled before I took it to the shop but ran like crap at idle. Any help or suggestions are greatly appriciated. My car has been in the shop for 6 weeks now and I want to get it fixed so I can enjoy the summer.