Scott Tyndall

I have a 1989 F150 XLT lariat with a 302 EFI . The problem I have is that under light load the engine pings lightly and you can feel it surging forward . Now it does pick up speed and seems to idle ok random missing at times . base timing is at 10° BTDC

Things done so far New

Intake gaskets
plugs
wires
cap and rotor
tps
timing chain
ecm temp sensor
checked grounds
BBK-3501 Throttle body
new PCV
new coil

Someone please help this truck is killing me lol