98 Lum ina

3.1 with auto. I have replaced plugs, wires, coil packs, ign module, both crank sensors, cam sensor,cat converter, etc. The car about once a week, has problem holding idle then will not go over 10 mph. Then after sitting a day, runs like nothing ever happened. I have check voltage, very good under load, checked all connectors for corrosion, found nothing. All filters changed and Im running out of ideas. ANyone else have a problem like this ?

Fuel filter, maybe. Have you had it scaned for codes?

Welcome to AF. Check fuel pressure when this happens, 37psi.