Backfire, stuttering, no power with gas

1992 DODGE DAKOTA
236,000 MILES • 3.9L • V6 • 2WD • AUTOMATIC
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SIMPLYSHAY
  • MEMBER
  • 1 POST
Cranks and idles great. Idles when in gear. When give it gas loses power barely gets to 35 MPH. Replaced crankshaft position sensor, coil pack, plug wires, cleaned battery terminals, checked grounds, cleaned MAP sensors, did code check.
Mar 29, 2021 at 2:19 AM
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KASEKENNY
  • ✓Experienced Mechanic
  • 18,907 POSTS
This sounds like a possible couple issues. Starting with checking for fuel pressure when you are driving the vehicle. The fact that this runs ok except when you give it gas points to an air flow issue/restriction or a fuel supply issue. Basically the air fuel ratio needs to stay around 14:1 and it can do this when idling but when you give it more air by opening the throttle either the air can't get through the engine to the exhaust or the fuel can't keep up.

https://www.2carpros.com/articles/engine-has-low-power-output

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

https://youtu.be/HiI_eeFg-2A

Let's start with all these guides and work through this just to find out what appears to be out of line and then we can go from there.

Let us know what questions you have. Thanks
Mar 31, 2021 at 8:42 AM
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