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could be several things... first off check your OBD II for any diagnostic codess (DTC) that will help isolate problems...if no codes it could also be 1. clogged/dirty fuel filter ( check fuel psi) 2. weak fuel pump ( check fuel psi) 3. vacuum leaks ( check for loose vac hoses, spray carb cleaner around intake, gaskets 4. weak spark caused by a bad coil ( spark should be blue white...if its yellow or orange its weak) do a resistance check on it. 5. Bad EGR valve or solenoid. 6 Bad MAF sensor 7. Bad O2 sensor 8 clogged Catalytic converter or muffler 9. ignition module or pickup coil bad.... check resistance readings

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โˆ™ 2008-06-07 00:30:33
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Q: What would make your 1994 mercury sable 3o l engine surge at an idle it runs great when you give it gas it does not stoll out but the engine surges up and down?
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