Had been running very smoothly until 2 weeks ago when it began backfiring and running rough, especially at low speeds, without my having made any adjustments to the engine. I've looked for arcing between wires, but have not seen any. Seems electrical, but I'm confused. Ideas?
If your car has a mas air flow sensor (usualy located right aroung air filter or in air passage after the air filter) check and clean the sensor. This looks like a small spring on the end of 2 wires. BE CAREFUL not to damage the sensor. I have seen where the sensor gets dirty over time and this can cause a rough idle.
SOURCE: engine runs rough at certain speeds 3.0 v6 flex-fuel 1999 ranger
Check and see if the EGR valve is leaking, to check this spray water on it at idle, if the water steams off the valve is leaking and is the source of your problem, also are you sure you hooked the new DPFE sensor up right? re-check it..
SOURCE: i have a 1994 gmc safari.It seems to have a smooth idle at times
Im not sure if you got it fixed yet! It could possibly be idle air control valve. But here some more suggestions! I had a 94 Safari van 4.3 liter I was working on for about three days and I finally figured out what was wrong with it. It would run fine for a couple minutes and as soon as I hit the gas and let off it would surge, but anyways I ended up changing the distributer, after the fuel pump and filter, mass air flow sensor, egr valve, idle air control valve, map sensor, and ignition module. So that might sove the problem if you were on the same track with it as I was. Hope this helps ya!
SOURCE: My 2003 VW Passat, 1.8 lt. The engine has a miss, runs on 3 cyl.
start with the fuel filter.
SOURCE: My 1998 Ford Explorer runs rough under hard acceleration
New plugs and wires?
Double check to make sure that you've got the routing and firing order right... if you have 2 switched, the car may still idle well but then pop and sputter on harder acceleration.
The next step would be to run some "Complete Fuel System Cleaner"... If that's the problem, you should see results within 20 miles or so.
SOURCE: Engine problem 1999 Ford Escort 4 cyl Front
Sounds like you make have a vacumn leak on one of the rubber vacumn lines that attach to the intake manifold. Check all of these lines and look for cracks, pinholes and lines that have colapsed.
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