Mine was 40 dollars.I was a Thermo King refrigeration unit mechanic and they use a relay that is similar to the fuel pump relay that was on my pickup.Over the years I think I replaced 2 on Thermo King units over about 10 years that they used them and there was 8 or 10 on each unit.There just is not much that can go wrong with them,but I guess they can go bad.Ok, I know what kind of engine you have now since you said 2 coil packs.I still think its your fuel pump.It could be a wire or bad ground.Surely some Ford mechanic will see this and maybe know what it is.Maybe a sensor too.You would think if it was a sensor that it would stay missing and not come and go.Also like somebody else said catalytic converter could be plugged up.Ive had that on a Ford myself a couple of times.If its that it will get to where it wont run at all.Easy to check,just unhook the exhaust in front of the catalytic converter and see if it fixes it.
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