Which 5 cylinders is it running on? Just kidding. How did you check the fuel injectors? The most likely causes of poor running, ie: running on 5 cyl, is worn, bad spark plugs, dirty, plugged fuel injectors, and ignition wires getting old and the insulation breaking down. The only good way to check the fuel injectors is to remove them and have them tested and cleaned in a fuel injector tester. If the ignition system is origional replacing wires and plugs is an excellant idea. Add fuel filter, air filter, oil change, and oil filter. You may also need an O2 sensor (depending on mileage). I also recomend replacing the seals on the fuel injectors and checking for vacuum leaks. If the fuel in the car is stale it will never run right so remove it and replace with fresh (if it smells like shoe polish it is time to go). After replacing all parts check timing, advance, (vacuum and mechanical), the cold start system, the idle system, and the lambda system. If the problem persists then you might need a valve adjustment and do a compression test to find the "dead" cylinder. David Teitelbaum vin 10757 --- In dmcnews@xxxx, "Payne" <bpayne@xxxx> wrote: > After the cold weather started, for some reason my baby will only run on > five cylinders. Everything was perfect up until then, aside from some minor > hesitation in the morning. After checking the injectors (the ones I can get > to) and finding them clean, I've just decided to do a tune up and replace