Hello fellow ford enthusiasts,
I have been having some problems with my 99 F350 5.4 engine. First of all it has just over 200k but I let it sit for awhile without driving it. I put fuel stabilizer in before parking it. While i drive it the engine occasionally misses and trips the check engine indicator. I just had a new fuel filter installed as well as new spark plugs and put fuel injector cleaner and octane booster in it. The problem still exists though. I am aware that the gas is older but am not convinced that is the problem. I had autozone hook it up to an odb code reader which spit out a couple generic problems. bad or stuck egr valve and sensor, I had both of those replaced just over a year ago. bad plugs, wires and/or coils. I just replaced the plugs. Im tired of throwing money at the problem. Any suggestions would be greatly appreciated.

 

Drive out the old gas and see if it clears up before throwing more money at it,

 

Thats good advice, I plan on doing that.

 

Also need the actual code #'s it is throwing.