[wiswind]

Several of you may remember my recent post about having the lower intake manifold gaskets replaced. That all seems to be doing fine.

Now I get the above mentioned codes, all together...in the order listed.
I notice on and off missing.
My mechanic told me that it is a fouled fuel injector, and gave me a bottle of Berryman's Chemtool B-12. He told me that cleaners, such as Techron, Redline, and Fuel Power (FP60) are detergent cleaners, and do a good job at keeping a fuel system clean. But that I needed a solvent based cleaner to clear up the injector.
He told me that it might take several tanks treated with the B-12 to clear it up.... Also, that it would likely be a full tank before I noticed any improvement.
I have seen improvement....but I am still having problems on my 4th tank!

I bougth a new injector from FORD and replaced cylinder #4 injector, as the P174 is a lean code for bank #2, which is the one that P0304 is on. Also, my original code was with P0304.

Still have the problem. From what I have read, a fouled injector would be expected to act up the most at higher RPMs. I do not notice the problem getting any worse at high RPMs. Sometimes there is no miss.....and sometimes there is. I can accellerate, taking the RPMs up to 5000 RPM with very smooth operation.
I have a 1 year old "improved" CCRM, which is where the fuel pump relay is on the '96.

I am thinking that the problem could be along the lines of a weak electrical connection for the wiring for the injectors....as that gets flexed during the lower intake manifold removal.
Other thing is a vaccum leak....which would be at the passenger side of the manifold.
I have checked the vaccum connections, found 1 loose, and PCV valve popped out of the gromet....but they did not improve things.
Will look more at the vaccum connections.
The IMRC is working just fine, pulling in to the stops.
I got 1 CEL in a 525 mile trip Wednesday night, with the same codes I listed.
So, I guess it is "better", but not fixed yet.