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1) Check for ignition problem. If you have a distributor, pay special attention to distibutar pickup and also ignition wires.

2) Check the TPS. Voltage should change smoothly as you move the throttle.

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Q: What is cause of 1994 Fore E150 with 5.0L engine when it boggs down after having changed the fuel pump filter and ignition module. Also did major tune and replaced the pcm.?
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