Thank you for your suggestion. What we decided to do was to replace the distributor cap, the spark plug wires and readjust the spark plug gage to 0.032. Also, we noticed that when we removed the spark plug wires, one at a time while the engine was idling, cylinder # 1 did not show a difference as noticeable in cylinders #2, #3 and #4. We then proceded to test for leaks in the intake manifold, especially near cylinder #1 by using a spray product, namely PB Blaster and spraying it on the intake manifold gasket. We were hoping to see a change in the idle/RPMs if there was a leak. But we did not notice any change whatsoever. In the next step, we wondered if this problem could be an indication that the fuel injector for cylinder #1 is not working properly. So, today we used a fuel injector cleaner when fueling the vehicle. At this point we decided to drive the car and so far we have not noticed the service engine light come on and the engine is no longer running rough as it did sporadically before. The vehicle is going to be driven for a long eleven-hour trip in the next few days and we would like to make sure we have done everything that can be done so that this problem will not reoccur during the trip. We would appreciate your comments.
Tuesday, August 13th, 2013 AT 2:07 PM