Take it back to whatever shop installed the rebuilt engine and make them troubleshoot the problem. There are no coincidences ...
However, "loud thumping noises" don't sound good at all.
SOURCE: Loss of Power
Does temp gauge go up when this happens ? When was fuel filter changed last? If not recently, I'd start there.
SOURCE: 2000 ford explorer 4.0 x-engine is stalling, missing and lose power while driving
I personally would check the fuel pressure. Then I would go back to the coil. I have seen brand new bad coils out of the box. The symptoms of a loss of power point to this component, especially if the car idles well, but loses power when accelerating. Please do not rate this reply - we all are left to grasp at straws since you have changed pretty much everything. Good Luck. Please post the final fix of the problem.
SOURCE: car starts runs for 5 - 10 min. shuts down wont
You'll need to determine whether your lacking spark or fuel when no start happens, do you know how to do that?
SOURCE: 96 Ford Explorer is studdering (misfiring) when going up hills
I have the same exact problem that just started immediately AFTER I got a tranny service where they changed the Trans Fluid, Trans Filter, Fuel Filter. Took it back and they say nothing is wrong with it. Took it to the dealer thinking I could get some REAL answers... they just told me to replace spark plugs, wiring & coil, for $900. Only studders when quickly accelerating above 40mph. I've check other forums, they say to clean the Mass Air Flow sensor. Haven't tried it yet. This seems the easiest before replacing spark plugs. Any other suggestions anyone?? Please.....
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