Chrysler Repair: 94 Sundance hesitating, vacuum hose, butterfly valve

Question
Hello again Roland. I contacted you several days ago about my sundance hesitating. From a dead stop to about 45mph she hesitates. There is no unusual engine noise, The plugs,wires,air filter and fuel pump were replaced 1k miles ago. The codes coming up are 55's. Ive been using fuel injector cleaner off and on with no progress. Not sure if the fuel filter was changed when fuel pump changed. Thanks again

Answer
Hi Floyd,
OK, without useful codes, we have to think of things that are not going to be detected by the controller. How about the egr valve? It is located in a small pipe that runs from the exhaust manifold back toward the throttle body. I don't know if you have the 2.5 or the 3.0L but in any case look for a small pipe and in that pipe look for a valve near the throttle body that is bolted into the pipe, has a flange and then a round top with a vacuum hose. Look in the flange area where you should see a rod which is the valve stem. The stem has a circumferential slot into which you can insert a screwdriver tip. Use that to move the stem back and forth against spring pressure in one direction that is trying to close the valve. Make sure that the valve closes all the way to a dead stop. And if it seems to not or to move with resistance, spray some WD-40 on the valve stem where it enters the valve body and then move it some more to loosen up the action. That may help alot. Write back and tell me which engine you have if you can't find the valve.
I would also suggest that you clean the throttle body throat, both sides of the butterfly valve, and the by-pass channel for the idle air.
Also check the PCV valve to see that it isn't gunked up. Those are cheap and easy to replace. Use the vacuum hose diagram on the underside of the hood to find it.
I doubt it would be the fuel filter, as that would usually cause trouble at high rpm on the highway, not in the low range, but they are not too hard to change. Locate it under the car near the fuel tank on the passenger side.
Those are some ideas to try. It may be that there is something more subtle or techinical but without a code or a diagnostic reader/scope it is difficult to deal with that circumstance.
Let me know what you learn and we'll go on from there.
Roland
PS Please rate my answer. Thanks.