Question... On my 88 F150 300-6cyl when idling in will idle up a little then down and do this several times then it will stall..... any idea's? I just changed the fuel pump and put new plugs and filters, changed oil..etc... It has been doing this for a long time, before the tune up. Also hesitates sometimes in slower traffic or slower driving conditions. Any help would be great!
Thanks, Tracy