97 V6 Rough Idle and Questions

I have a 97 V6 automatic that I have a few questions about. My truck seems to idle rough when it is in gear , either forward or reverse, but it is ok in park or neutral. I have cleaned the throttle body and the air filter is a new K&N filter, but the engine still seems to idle a little rough. Any suggestions.

I have read in a couple of forums and posts about resetting the PCM by unplugging the 3 plugs for 10-15 minutes to reset the learned parameters, but I haven't done this as of yet. Any suggestion about this?

I also noticed that the truck seems to take quite a while to warm up and I have noticed that the radiater fan is always turning no matter what, is this normal or could the fan clutch be bad?

I have searched and read all sorts of posts and I am just trying to get some info on what might work best.

Anyone ever hear of a mod where to you remove the original airbox snout/trunk and make the hole bigger to allow for more air to flow to the filter box? I have read that this can help to increase gas mileage but may reduce HP a bit on the downside? Any thoughts?

Thx for any help and suggestions.

I have a 97 V6 automatic that I have a few questions about. My truck seems to idle rough when it is in gear , either forward or reverse, but it is ok in park or neutral. I have cleaned the throttle body and the air filter is a new K&N filter, but the engine still seems to idle a little rough. Any suggestions.

I have read in a couple of forums and posts about resetting the PCM by unplugging the 3 plugs for 10-15 minutes to reset the learned parameters, but I haven't done this as of yet. Any suggestion about this?

I also noticed that the truck seems to take quite a while to warm up and I have noticed that the radiater fan is always turning no matter what, is this normal or could the fan clutch be bad?
Thx for any help and suggestions.
Have you checked for trouble codes? I think you can still extract the codes by turning the ignition on/off (without starting the engine) 3 times... leave it in the on position the third time. The check engine lite will flash the trouble code if any. There are quite a few codes that don't illuminate the "check engine".

Yes I have checked the codes and all that I seem to get is 55.

Thx, fastlife


Have you checked for trouble codes? I think you can still extract the codes by turning the ignition on/off (without starting the engine) 3 times... leave it in the on position the third time. The check engine lite will flash the trouble code if any. There are quite a few codes that don't illuminate the "check engine".

The fan has a viscous clutch and will turn with the engine... should not free-wheel with the engine off and turned by hand. As far as the rough idle, you might try some of the easy stuff first like cleaning the injectors.