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

Your Answer


Looking for a Used Mustang in your area?

CarGurus has 38,355 nationwide Mustang listings starting at $1,995.


Ford Mustang Experts

  • #1
    Tom Demyan
  • #2
  • #3
    Bob Beaman
View All

Related Models For Sale

Used Chevrolet Camaro
236 Great Deals out of 30,155 listings starting at $4,980
Used Chevrolet Corvette
84 Great Deals out of 15,829 listings starting at $3,000
Used Ford Mustang SVT Cobra
7 Great Deals out of 259 listings starting at $3,000
Used Ford F-150
2,521 Great Deals out of 220,358 listings starting at $1,222
Used BMW 3 Series
935 Great Deals out of 33,171 listings starting at $1,000
Used Chevrolet Silverado 1500
2,175 Great Deals out of 151,474 listings starting at $1,995
Used Jeep Wrangler
301 Great Deals out of 20,190 listings starting at $2,900
Used BMW M3
15 Great Deals out of 1,751 listings starting at $5,495

Used Cars For Sale

2018 Ford Mustang For Sale
15,440 listings starting at $19,870
2017 Ford Mustang For Sale
70 Great Deals out of 7,382 listings starting at $15,997
2016 Ford Mustang For Sale
31 Great Deals out of 2,334 listings starting at $12,391
2015 Ford Mustang For Sale
27 Great Deals out of 2,179 listings starting at $11,989
2014 Ford Mustang For Sale
28 Great Deals out of 1,878 listings starting at $8,988

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.