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Engine Runs Rough and Back Fires In Forward Gear

(1994 Dodge Ram 1500)
in Chicago, IL on February 11, 2011
I have a engine wiring problem with my 1994 Dodge Ram 1500; When I drive in forward gear the engine shakes and runs very it back fires when I step on the gas pedal - No power at all!!

But, when I drive it in reverse gear, the engine runs smooth and fine...No back fire or running rough!!!

My truck has been parked for about a month now, because of this problem, I had a complete tuned-up in the fall of 2010, everything was fine up to this point. My buddy and I checked the spark plugs wires to see if they were not loose and also made sure the distributor cap was secure...and we checked the spark plugs to see if they were gapped right.

Everything checked out okay!

When my friend and I were just about to give up, we tried one more thing - my friend put the truck in forward gear and held the brake while giving it some gas; Under the hood there's a bunch of wires in a black curly tube on the body of the truck above the engine...I started shaking that tube of wires and the engine smoothe it self out and wasn't running rough anymore.

So, I drove it around for about 20 minutes everything was fine, I guess once the engine got hot...the problem started up again - running rough, back firing, No power when I stepped on the gas. This only happen's in forward gear, it doesn't happen in reverse gear!!

We think it's a bad wire some where,that's broken, rusty or hitting against the engine, but where do I look...what wire would cause this type of problem?

Need Help Bad!

Thank You,
Terry Clark
Displaying 1 answers & 2 comments
Popular Answer
on February 15, 2011
Yes, you have a wiring issue. When the vehicle is in forward motion, the drive line torques (twists) in one direction, when you are in reverse, the driveline torques in the opposite direction. I would have a qualified technician inspect all of the wiring inside of the harness for broken wires, loose connections etc. Keep in mind that the wires may look fine from the outside (insulation) but in reality, the wire (conductor) is broken inside where it is not visible. Run your engine in gear and watch where the most movement in the harness is located. Start your inspection from there.
on February 16, 2011
Thanks Johnny Mopar,

Your answer was of great help to me, I didn't think I would get a response so quickly...I will do what you suggest.

Thanks Again
Terry Clark
on March 01, 2011
What sensor could cause this problem?
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