98 5.9 no start

truck has 147k, i park it in the driveway after work next day nothing, so i charge the batt due to no lights on dash. now it will crank but wont turn over unless i pump gas pedal then keep foot on pedal. but one take foot off pedal dies. so i been looking at different post and seen one a pick up coil issue and another one was cam senor. no CEL light. has spark n fuel pressure so what could be wrong?

Does it run smooth with your foot on the pedal?

yes and no. just went back out and tried starting it. pump pedal again and it ran but dip low rpms but jump back up. shut off and tried starting up and it did but dips low rpms again.

You might try cleaning the Idle Air Control with some carburetor cleaner.

thanks ill try that then update how it went.