We were doing something else unrelated and I was farting around and pulled the vent line off the carb's float bowl. The RPM instantly changed. It isn't supposed to...

Turns out that was my first run in with a dirty air filter on the gas tank vent! There is this $2.00 filter that goes on the bottom of the charcoal canister that is supposed to get changed every major tune up. The first one is a bear to dig out, but subsequent ones just tuck in and out.

When plugged, this canister does the neatest imitation of starving for and up and running out of gas by creating a vacuum on the gas tank and carb float bowl.

To test this, you can either drive with the carb float vent line off or next time it starts acting up, crack the gas cap open to release the vacuum.

Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Canadian Off Road Trips Photos: Non members can still view! Jan/06 http://www.imagestation.com/album/pictures.html?id=2115147590 (More Off Road album links at bottom of the view page)

wisconsin262@gmail.com wrote:
> I have a 1985 Plymouth Grand Fury that has been giving me a problem
> lately, and I am puzzled as to what my next step should be.
>
> First, I should tell you that this car has a 318 cubin inch, 5.2 liter
> engine - 2 barrel carburetor, an electronic full control computer,
> (Holly carburetor - 6280) - lean burn engine. This car has low
> mileage.
>
> My question: After getting warmed, the car will cut out and acts like
> it has intermittently no spark and also feels as though it's running
> out of fuel. I have put on a new gas tank to make sure that it's
> clean. Also, I have replaced the fuel filter, anti knock sensor, air
> temperature sensor in the manifold, oxygen sensor, magnetic pick up in
> the distributor (single pick-up) and also replaced the fuel control
> computer, unit # 4288576.
>
> I have also rebuilt the carburetor and made sure that everything was
> working properly except for the electronic metering which I could not
> get any longer. After replacing the fuel control computer, the car
> now has a severe knock on slight acceleration and the car still cuts
> out as previously described. At times the solenoid in the engine
> compartment for the EGR system mounted on the firewall starts to
> sporadically operate. When this happens, the car begins to miss out
> severely. The EGR system is all controlled by the fuel control
> computer mounted on the side of the air cleaner.
>
> Is there a reliable source that I can get a computer from? I feel
> that this could still be the problem or could you provide me a list of
> parts to change this over to a non-routing (that will still legally
> pass emissions)? Any other suggestions that you have would be greatly
> appreciated.
>