2000 Ford F150 ENGINE MISSING

[quote:d7fda89b98="triton1"]Engine Performance problem
2000 Ford F150 V8 Four Wheel Drive Automatic

wHAT COULD BE THE PROBLEM MY MOTOR STILL HAS A SLIGHT MISS TO IT,I HAD IT TO THE DEALER WITH CHECK ENGINE LIGHT ON DID THE TEST AND #8 CYL NOT FIRING PUT NEW COIL ON LIGHT WENT OUT BUT TRUCK STILL HAD A MISS COULD THIS BE JUST A BUILD UP OF RAW FUEL IN THAT CYL?
ANY IDEA ? ANYBODY? ALL NEW PLUGS HAVE BEEN PUT IN ALSO
2000
FORD 4X4
5.4 TRITON[/quote:d7fda89b98]

No it's not leftover fuel. All the fuel is well out of the system.

Personally, I would just go back since they did not do the job properly, unless of course this is an un-related issue. With the vehicle mis-firing I would run a cylinder balance test to determine which cylinder is acting up, then go from there.

When does it mis-fire? under load? idle? cruise?

The miss has left, and it came underload. but i think what i was blaming as a miss is somthing else
when I am driving down the road and come to a hill the motor lugs down and starts to jerk it isnt shifting out of overdrive as fast as it should if i use the button on the gear selector and manually take it out of overdrive the truck drops to drive the revs come up and the jerk stops.
has me puzzled.