99 ford mustang 3.8l


Asked by Mar 12, 2017 at 09:09 PM about the 1999 Ford Mustang

Question type: Maintenance & Repair

I have a 99 ford mustang 3.8l I bought not long
ago, then man i bought it from said it had been
sitting up for 5 months, I have changed the plugs,
wires, fuel filter, air filter, oil, crankshaft sensor,
camshaft sensor, dropped the gas tank and
drained old gas out, brand new battery, checked
and replaced all fuses, the car will crank but will
not start unless I pump the gas, if I hold the gas
down it back fires and won't start but I can pump it
and will start, once its running it idles good but
when I put it in reverse it trys to die then I put it in N
and the RPMs shoot up to 2500, put it in drive and
it hesitates a minute then shifts in a will spin the
tires without me pressing the gas but then trys to
die unless im giving it gas any ideas on what could
be causing my problem? Also check engine light
isn't on so it isn't throwing any codes, any advice is
much appreciated

3 Answers


Check the mas air sensor

Best Answer Mark helpful

get it to idle first ,you have little idea of this cars history , what did the plugs look like ? when you crank it over it should fire and run if it has gas and spark ,back firing isn't good , if thats what it does find the problem , How are codes pulled , do you have the obd port ? scan for codes even if the light ain't on . let us know what happens


The plugs were filed down, codes are pulled from OBD port with my OBD2 code reader and doesn't read any codes because the check engine light isn't on which means what ever the problem is isn't throwing a code Ill check the MAF sensor tomorrow

1 people found this helpful.

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