Suzuki sidekick jx runs good when cold after it warms up it revs up & down

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http://www.obd-ii.biz/carinfo/suzuki/suzuki_sidekick_1.6l/1998

is this sport the J18 . 1.8L sport?
?
the 95 and 98 are here.
96 is hard to find, as is the extremely rear J18 sports. very hard.

http://www.fixkick.com/index9.html

I don't know anything about these models, but my first guess would be to check the ECT(engine coolant temp) sensor and wiring. Sounds like the ECM thinks the engine is cold all the time. High resistance in the temp sensor circuit will cause a colder then normal reading at the ECM.

Check the combination switch to see if current is passing through.

Need an owners manual for 1989 Suzuik Sidekick JX

If I were you, i would check the fuel pump relay. I know when my 92 suzuki sidekick did that it was the fuel pump relay. Good luck

Another problem. Cupping would be from alignment. Dry rot is dry rot. All tires will do it.

it should be on the rear side of top case the by the on the valve cover opisite side of where you put oil in

maybe slow,cold start,air control valve or,possibly normal for temp in morning,I live in Australia and cars can take ages to slow down in winter eg1 to 3 deg cel...and very quickly warm up in summer..eg....idle slows down in 1/4 time,have a look at the car if you can park it in warmer conds... to see if its quicker as Toyotas do this normally for fast warm up,lastly has it been well serviced...looked after??

Buy a bottle of Techron Fuel injector cleaner. It's sold in many grocery stores and all auto parts stores. Pour the whole bottle into the gas tank when you can fill up. Drive the car and don't put more gas in until the car is almost empty. That should fix it