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my 92 aerostar surges at speeds above 70mph the engine ranges from abtou 2000rpms to abotu 3000rpms. it surges abtou 3-500 rpms i was thinking fuel system, anyone else have a problem liek this befor?
Sounds like it could be the fuel filter, and yes, mine did the same when it was clogged. Power picked up considerably when I changed it. When was the last time it had a tune-up?