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What causes misfire, loss of power, rough ride?

(1999 Ford Expedition)
in Houston, TX on June 04, 2014
I have change the master flow system, spark plugs, oxygen censers, but haven't change the coils. Just can't not figure it out. I thought bit maybe a vacuum leak.
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on June 04, 2014
Now it's time to have it scan tested to help find the actual problem!... Vacuum leak, low compression on one or more cylinders, fuel injector issue, ignition coil, to mention a few possibilities....., A real 'scanner' can run cylinder contribution test to isolate problem cylinder(s) and save all that guessing!! Along with unnecessary parts replacement.....!
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on June 04, 2014
Thanks, I'm going to try that.
on June 04, 2014
U welcom... that usually winds up being the best choice!
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