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1999 Ford F-150 engine idles but boggs when gas pressed

Tiny
TUCKINTACO93
  • MEMBER
  • 1999 FORD F-150
Engine Performance problem
1999 Ford F150 V8 Four Wheel Drive Automatic 180k miles

b4 I have ruff idle. It would run fine then after start to idle ruff then it would bring the rms back up and run fine. The check engine light was on so I scaned it and it came up bank 2 sensor 1 was bad so I fixed that why I had the pipes off I fixed the only manafold bolt I thought was broke turned out to be the 2 bolts on the back cylinder. Now I have this problem. When in all gears and park when I barley push the gas it bogs down and then revs up but if you rev it from start it will not bog down. It only losses rms for a sec or 2 but something this truck never did.
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Sunday, August 8th, 2010 AT 9:38 AM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,269 POSTS
Has the check engine light ever come back on? Have you checked fuel pump pressure and for vacuum leaks?

Let me know.

Joe
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Tuesday, August 10th, 2010 AT 10:41 PM
Tiny
TUCKINTACO93
  • MEMBER
  • 1 POST
Yea the check engine light is on.I have to wait till I can buy a fuel gauge to check it. Whats a way to find a vac leak if you cant hear it
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Saturday, August 14th, 2010 AT 8:03 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,269 POSTS
If the check engine light is on, have the computer scanned. Most parts stores will do it for free. As far as the fuel pressure, most parts stores will lend or rent the gauge to you. The only thing you can do with vacuum lines is start looking for cracked, dryrotted, disconnected. Some people use carb cleaner and spray it on the hoses. If there is a leak, the RPM's will go up. I don't like doing it because there is a risk of the fluid hitting something hot enough to catch fire.
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Sunday, August 15th, 2010 AT 12:17 AM

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