5.4-Intermittent loss of power
I appreciate any help i might get to find a solution to my problem.'99 E-250 w/ 5.4 travelling w/ gross weight EVERYDAY (8600 lbs),324,000 miles.Recent full tune-up,new ignition coils @265,000.This is the best truck I have ever owned.It is one of a small fleet of e-250 and e-350's.Problem-loses power intermittently, hit the gas and nothings there.Let off the pedal,hit it again and you might have power.Sometimes bogs at low r's then picks up like a 2 stroke.At cruising speed under light acceleration it will ping-sometimes.The check engine light does not work but it was hooked to a diagnostic machine recently and wasn't showing a code.Also passed New Jersey inspection recently.This engine idles perfectly and burns 1 qt of oil every 3000 miles (oil change interval).Any suggestions? Need more info? Thanks in advance..