Re: '92 f-250 inline 6cyl, rough starting only...
Start with the basics. Check condition of plugs an wires, check fuel pressure both running and after sitting. Unplugging the mass airflow will cause the change you describe but doesn't usually cause your symptoms, same with the TP sensor.
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plugs and wires are new.... i have found out that its actually the idle air control motor that sits on top of the intake... when i unplug it while normal running, it replicates the problem...
i will check the fuel pressure before cold start up and after... what are the spec limits for the fuel pressure?
thanks for the help