I have a 1998 f150 4.6 liter engine need to know why when in park it idles fine then I put in drive and give it gas it runs rough and back fires?

Asked by Aug 16, 2013 at 08:26 PM about the Ford F-150

Question type: Maintenance & Repair

I have already changed spark plugs and wires and two coil packs also changed two fuel
injectors.  But first I put a new fuel filter in.

2 Answers

25,315

Hook up a gauge and actually measure the fuel pressure. Are there any codes in the computer or is the check engine light on? I have seen MAF sensors cause this concern but I'm still leaning toward the fuel pump. Don't spend money on either until you check it out. It could get expensive real fast and you still may not fix your truck. The other thing that comes to mind is a plugged catalytic converter. You can unbolt the exhaust and run the engine to see how it preforms.

1 of 1 people found this helpful.
Best Answer Mark helpful

Tried the things you said, still doing the same thing.

Your Answer

Ford F-150 Experts

  • #1
    OJ
    Reputation
    8,760
  • #2
    dandyoun
    Reputation
    4,480
  • #3
    tennisshoes
    Reputation
    3,010
View All

Related Models For Sale

Used Chevrolet Silverado 1500
2,132 Great Deals out of 181,503 listings starting at $1,898
Used GMC Sierra 1500
790 Great Deals out of 67,767 listings starting at $1,350
Used Dodge Ram 1500
401 Great Deals out of 10,657 listings starting at $1,500
Used Ford F-250 Super Duty
339 Great Deals out of 43,336 listings starting at $1,250
Used Toyota Tundra
436 Great Deals out of 33,419 listings starting at $1,999
Used Toyota Tacoma
562 Great Deals out of 41,710 listings starting at $2,999
Used Ram 1500
928 Great Deals out of 115,280 listings starting at $6,499
Used Ford F-250
472 listings starting at $3,490
Used Ford Mustang
741 Great Deals out of 42,181 listings starting at $1,300
Used Nissan Titan
211 Great Deals out of 19,369 listings starting at $2,300
Used Chevrolet Colorado
248 Great Deals out of 29,666 listings starting at $2,395
Used Ford Explorer
798 Great Deals out of 62,677 listings starting at $1,425
Used Chevrolet Tahoe
635 Great Deals out of 36,921 listings starting at $1,800
Used Ford F-350 Super Duty
340 Great Deals out of 23,368 listings starting at $1,895
Used Chevrolet Silverado 2500HD
321 Great Deals out of 29,090 listings starting at $2,650

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.