2002, 197K, 2.7L, 4x4. Maine, cold climate.
I bought this truck a few years back with 9X,xxx on the clock. Since that time I have done nothing to the engine other than change the oil, filters, etc. No "tune ups" or dealer recommended services. Typical maintenance only. I noticed a slight hesitation at low rpms (1500-2200) about a week ago. As of last night it was starting to get worse. Yesterday I had the oil changed. After the oil change I was driving to my office with verly little gas in the tank (light was on) and it started to miss pretty bad. Filled it up with regular, no change, still missing. This morning i drove it over 200 miles, still acting about the same. Once the tank got down to about 2/3 full i put in some techron and topped up with 6+ gallons of Super (which is 91 around here). So far i don't notice much difference, if any at all. I realize I need to let the full tank run through, but just wondering if anyone has any thoughts on injectors being dirty? should i change the plugs?? etc. Thought it might be bad gas, but not sure now...
On the highway at 70mph it misses intermittenly, maybe once or twice a minute. It is definetly a lot less frequent up at highway cruising speed, especailly if the road isn't real hilly. Accelerating from a stop it is really bad, feels like the whole thing is going to die right there, but i keep the revs up and it seems to kinda power through it, still missing, but not as bad. Seems to miss worse at 2000-2750, not as bad at 3000 plus (not that i get up over 3100 for lengthy periods).
Anothe note, the gas/air sensor at the front of the exhaust has tripped the CEL for about 5 years, never goes off. Currently when the missing is bad (accelerating from a stop) the CEL will blink.......not sure what that is indicating, other than "hey moron, there is a problem"
Thanks in advance