Misfires on start up
My truck has an ongoing rough idol on start up. Engine rebuilt a year ago. New plugs, wires, coil, tbps, all new o2 sensors, egr, cat, IAC.
Next moves.
Putting on new coolant temp sensor, replacing fuel filter.
Questions
I took wire off IAC. Truck rpms drop drastically. Does that prove no vacuumed leak or should I go to smoke test?
Fuel pump has 300 thousand miles but seems to hold pressure at 57 while running. Should I just replace fuel pump as it is so old?
Check engine light keeps coming on p0301 and p0303. But runs smooth after a few minutes. Seems smooth on road.
What next?
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1999 Ford Ranger XLT 4 door, 2 wheel drive, 6 cylinder 3.0 flex fuel engine with ac.
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