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Message: <blockquote data-quote="ctandc" data-source="post: 1532836" data-attributes="member: 30345">Air, Fuel and Spark.  Personally, I never take for granted the previous owner did anything right.  That's just me.If it were me?- Replace spark plugs (I'm sure plenty will chime in - but the 5.0 EFI in my opinion always liked cheap Autolites the best - maybe that's just me)- Wires (you can easily test them)- Cap and Rotor (check yours - GOOD quality replacement are not expensive)- Set timing correctlyIf the problem still exists- Fuel pressure checks- The fuel filter ever been replaced?These cars are getting old.  People may say "parts cannon" - but I've fixed up plenty of 20 year old cars where normal maintenance items have never been replaced. Even if that wasn't causing the problem, it's cheap insurance if you plan on keeping / driving it.  I had an intermittent issue with a 5.0 EFI truck...it would run fine for days, then sputter, run like crap only at certain RPMs etc. Did timing check, fuel pressure check, visually looked at the fuel filter (it looked OEM) replaced it.  The old filter RATTLED when I shook it. Something had broke loose inside and apparently would randomly partially block fuel flow.- Aftermarket air intake? Filter clogged?  Etc.HTH</blockquote>