Suzuki: Tracker -low rpm, throttle position sensor, warm weather

Question
Hi, I have a 1998 4wd-4dr 4cyl Tracker- purchased it new- it has about 97,500 on it now- NEVER had a problem-all I ever repalced was a $10.00 temp A/c switch in 2007-tires of course- fan belts-plugs & wires. I started her up the other morn (22degrees out) and it warmed up as ususal, I noticed that the rpm's were dropping a bit below the on dash guage-looks about to below 900 and the engine would stutter and then the rpms  would pick up by itself to the normal just below the "1" - when i put it in Drive-rpm's dropped- by stepping on gas they came back up- she's been faithful to me- so not to breakdown on the street- i took my other car- Started Tracker up the next day -same thing but not as bad- I have't cked anything in detail yet -it's been too cold here with snow storm -but a quick look under the hood- things looked ok- I suspect maybe some type of sensor or module- or maybe it's time to  overall routine maintenance? No new gas-Gas is at 1/2 a tank at regularly used station i'v been using all week- It's ALWAYS run smooth-It's my daily driver- appreciate suggestion-I do have a Haynes manual- Thanks a bunch

Answer
It's most likely the signal from the TPS (throttle position sensor).  The sensor may not be bad, may just need adjustment.  I had an 89 sidekick years ago, and had a similar issue.  I was forced to buy a Suzuki Factory Manual to get the adjustment sequence.  I don't have any faith that any of the aftermarket manuals have it.  It can be ignored if it doesn't die at idle, I did that for the first six months, and was finally forced to but the manual to get the adjustment procedure, and values. A year after that, I finally had to replace the sensor.  How about pray for warm weather?
scotty