I have a 2001 3.0 6 cyl.

I have put a new serpentine belt on to get rid of the squeal. Since then I have been having a problem with the check engine light.

Code says miss fire on 5 and 6 cylinders.

I have replaced the plugs, wires, coil pack, and ran fuel injection cleaner through it.

Whats my next option?

Some say its the injectors. Some say its the computer. Some say its the fuel filters. So far I have put almost a grand into tracking down the problem between parts and labor.

Any help would be very appreciated.

Rob

What exactly is the code number?

__________________

dont remember off the top of my head. but ive had it read at autozone. that is what their reader said. I will try and get the actual codes later today.

Codes issued in computer 305 and 306. Guy at autozone said could be vacume lines?

Here are the Ford says about your codes:

P0301 through P0310 - Misfire Detection Monitor

Description: The misfire detection monitor is designed to monitor engine misfire and identify the specific cylinder in which the misfire has occurred. Misfire is defined as lack of combustion in a cylinder due to absence of spark, poor fuel metering, poor compression, or any other cause.

Possible Causes:
Ignition system
Fuel injectors
Running out of fuel
EVAP canister purge valve
Fuel pressure
Evaporative emission system
Base engine

Diagnostic Aides:
The MIL will blink once per second when a misfire is detected severe enough to cause catalyst damage. If the MIL is on steady state, due to a misfire, this will indicate the threshold for emissions was exceeded and cause the vehicle to fail an inspection and maintenance tailpipe test.

__________________
'20 Ranger Lariat FX4 Oxford White