I have a 2003 dodge durango i changed all the plugs but now it has a high idle. i checked all the gaps and they are exactly at the recommended setting. when i was changing them a plastic line came unhooked on passenger side of engine. the one end connects to the oil fill neck(just below oil fill cap) but i can't figure out where the other end connects to. can someone help me?

make sure all PLUGS are good and you did not break the cermic on any, upon installing. Then put your plug wires back on as you push in the boot twist left to right slightly. Also check your plug wires make sure none of them were spliced and grounding out. good luck.

- Faulty throttle position sensor
- Throttle position sensor harness is open or shorted
- Throttle position sensor circuit poor electrical connection
- Faulty Powertrain Control Module (PCM)

may have knock off a vacuum hose. check the hoses in the area you were working.

A code P0440 could mean one or more of the following has happened:

• The gas cap is not installed or working properly
• The purge solenoid has failed
• The canister is plugged and not working properly

Do the plugs smell sweet? Your have 3 plugs side by side on the passengers side of the motor missing. A sweet smell would point to a head gasket leak.

you have a couple of wires crossed and or even though they maybe new! bad spark plugs or incorrect gap. also check to see if you left and wires touching the exhaust mainfolds

When engine running, ensure no engine combustion gas bubbles in coolant resevoir (if so, the head gasket is blown).

Check cooling fans are operating ok (when required when car warms up), if not check
1) fuse,
2) relay operation,
3) heat sensor switch.

Replace thermostat.
When re-filling cooling system, bleed off any airlock as necessary.

Check for collapsing (soft) coolant hose on suction side of waterpump when engine revs above idle.

Sounds like more than one problem.As for the heating issue could be a (weak) water pump.If the miles are pretty high it wouldnt be a bad idea to service the tranny either.My 5.9L dodge shifted funny too. I changed the fluid and the screen. Also put a little sea foam in it.

Sounds like poorly gapped spark plugs, I would check gap.

First check for a loose hose or a vacuum leak. If you do not find a leak most likely the throttle position sensor is stuck and causing the truck to idle high. The throttle position sensor sticks, and if this happens you will need to replace it.