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I recently replaced both cylinder heads as they were both cracked internally. Also a head gasket set so all gaskets were replaced. Now I have a rough idle. The RPMs drop and jump when idling, and sometimes they will drop when I let go of gas while driving. I pulled code P0171, lean on bank 1...

After a while of diagnosing why my 99 Explorer OHV was overheating, we finally confirmed head gasket. Ripped out cylinder heads and sent them to a machine shop to get pressure tested(won't find anything out until tomorrow or Tuesday). I cleaned the mating surfaces on my block and visually...

I'm currently in the process of a head gasket/cylinder head job on my 99 explorer 4.0 push rod. This is what my valve covers are looking like. My buddy says that is normal amount of moisture in my oil but I'm not sure. Everything else is pretty clean so far, but didn't get the head bolts out yet...

-My explorer recently had coolant issues where there was a lot of back pressure and was overheating. Had a combustion leak test done, and it didn't detect head gasket leak. A mechanic buddy told me a clogged radiator after two days of messing with it. I replaced the radiator, and after burping...