I have a stock 1989 YJ with the 4.2L 6cyl. The other day I had to pull over because the jeep was missing badly. <img src="/forums/images/graemlins/confused.gif" alt="" /> After I stopped I noticed the muffler was red hot inside (saw thru a crack at the weld joint). Smoke was coming from the muffler. I called a muffler shop and they told me the catalytic converter had gone bad. I then took it to a local muffler shop this past Sat. They replaced the catalytic converter with a ôcoolerö one (one used on a truck). I also had them put on a Flowmaster muffler. Seemed like everything was working OK until the jeep stopped running while at a stoplight. After looking under the hood, I noticed that the air-fuel mixture solenoid on the Carter BBD was broken. Bought a new one and just finished replacing the solenoid tonight. Once again, the jeep seemed to run OK until the engine came to an idle (full open choke). The engine just dies and canÆt start again until the choke closes (partial or all the way).
Could my problem be in the cooler catalytic converter?? Or the Flowmaster?? I thought this since the engine is warm / hot and maybe the new cat is blocking the exhaust flow (back pressure).

Any help would be very useful

4x4david
<img src="/forums/images/graemlins/confused.gif" alt="" />