1999 Ford F-150 Questions

All 1999 Ford F-150 Questions

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WHAT IS THE MOST PROPER SPARK PLUG GAP FOR THE 4.2 L V-6
Lost the keys. He took the Ingnition out and found and keys put it back in and it started once after but won't start now
Replace brakes and wheel clyinders and bled both sides of the truck in the rear
ive changed the fuel pump fuel filter and plugs and wires and it still wants to sputter after its warmed up
Happened right after they fixed my heater was fine when took it in
just started tonight, did it all way home 30 mile, not because of bumps. Did it at random. Affects all lites.
engine misses, bad idle
The truck turns over but won't start on occasion, like the ignition isn't firing . It only does it now and then but I don't want to get stranded .Is there a test to check the key, when it does it the theft light stay...