92 Dakota misfire code 27
Hello to all. I just recently joined and I am posting my first question. My 1992 Dakota, 3.9L 2WD has developed a engine misfire. The truck has 221,230 miles and this is the first problem encountered with said truck.
During idle, off idle, or cruise the engine will stumble, feels like a dead cylinder and check engine light illuminates. The condition is erratic, will run okay for a couple of days and then the problem returns. I scanned the engine computer numerous occasions at O'Reilleys and consistently read code 27, left bank misfire, input signal low or not detected, cylinder one misfire.
At this point I have replaced the fuel filter, ignition coil, plugs, plug wires, rotor, distributor cap, crankshaft position sensor, thermal temp switch and removed and cleaned the idle air control valve, and throttle position sensor indicator.
I feel the ignition system is the culprit. In the driveway when the problem occurs, I detect the smell of an excessively fat, rich mixture which would suggest that the injectors are delivering fuel but not receiving spark.
I am at wits end. Should I replace the distributor next. I opened up the Schrader valve on the fuel rail near the intake manifold and gas shot towards the firewall so I think fuel pressure is okay.
I realize this is long winded, please help. Thanks