Chevy & GMC Vans

1998 Safari with 160000 miles having trouble with a intermittent misfire when cold or if it rains or if humid out side it runs very bad. Around here it misfires about 10 or so minutes its docent rain a lot here. But at the beach it its bad any ideas what it could be would appreciate any help. Its driving me crazy.

Replaced wires , plugs and cap rotor temp sensor and a air sensor that goes on air intake hose.

possibly the only remaining ignition piece ... the coil.

Replaced to sorry didnt post it but no difference
made.

Check your distributor for excess play in the bushings. I had the same symptom and a new dist. cured it.

will have to try that this weekend if no work thanks keep you posted.