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First post....very glad to be here, awesome forum!

I bought a 98 PF with 90k miles last week. It's a great vehicle but has one problem - very rough idle once it's warmed up. The warm idle is at about 650rpm in gear. Is this normal? I also am getting a code PO300 (random misfire). Changed plugs, wires, cap, rotor, fuel and air filter but nothing helped. I also sprayed all around the intake manifold looking for vacuum leaks but didn't find any. It seems to run fine above 1000rpm.

Based on other posts here, I'm thinking it might be a weak ignition module in the distributor. I did go into the distributor and check for play in the shaft, oil, etc but it was clean inside with no apparent problems. Any other ideas?
 
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