truck dies while am going on the freeway.its been dieing in the past once last year but know it happens every day.Just pick it up from local dealer and they did not want to look at it."truck has been to modify for them to look at" was there responce but tech took it out for a testy drive and everything was ok.my advisor said.but still the check engine light does not come out.I just did a major service and still acts up.it figure the spark plugs and wires were bad .I endup replaceing the plugs (bosch platium 2)wires(ford racing 9mm) coil packs(msd ignition packs) and fuel filter but still dies .

my set up of my truck is
bosch patium plugs
ford racing wires 9mm
msd packs
superchip
KnN flip kit
gibson system from headers to the end
410 gears
please help any sug will do

 

Confused...Does not go out or does not come on? If it comes on, any codes?

The cutting out of the freeway is probably the chip not being seated correctly. Any other symptoms?

 

those are symptoms engine revs high and them dies .engine light does not come out. 1999 f150 4.6l