1992 Mitsubishi Missing Options

[bumpn]

hello my 92 mits 3000 gt 3.0 sl has been throught alot...it has seen a new computer as well as a new iac and new ptu... the car will run and drive down the road but feels like it has a slight miss upon first taking off from 0 mph after you get going it seems to be ok... i do know it has brand new plugs in it so does anybody have any ideas... has just recently sat for bout three years

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[Lewiman06]

misleading title

[Lewiman06]

when is the last time the timing belt got some attention?

[bumpn]

im not exactly sure last time the t belt has had any attention...i do know the car has 140000 miles on it tho and i have never had it replaced.. if the t belt is the case tho woodnt my engine already be a goner??? this is just a problem i am tryin to diagnose as the problem seems to be getting worse...once again what i am experiencing is kinda sluggish take offs and now even hesitation during normal crusing. you can feel it missing some where... i have taken out the 3 plugs in front bank and they all seem really clean and not wet or oily... have not taken out other 3 in back yet as this requires takin off the intake... the car hasnt been ran in three years and had a quarter tank of probally bad gas in in after sitting 3 years... since then i have probally put in bout 8 gallons of fresh 93 octane fuel as well as a can of berry man b-12 chemtool and a bottle of injector cleaner and have drove car bout 60 miles so far... what is it i shood be lookin for to replace??? coil packs? plug wires? injectors? etc... the other odd thing is that there is no check engine light on as this went away wen i replaced the ptu.
things i have just replaced: ecu x2...ptu...plugs...iac

[spike-3000gt]

have you tried check out the idle contol motor ......if your revs are all over the place ie ....between 200 -1.2 moving then it could be fludding the engine when starting off.

have a look at this and see if it is that...

http://www.stealth316.com/2-isc-iac.htm

[JeffWVR4]

The timing belt can stretch, and the tensioner can fail. Eventually the belt will break, but stretching can cause it to jump teeth on the cam sprockets or crankshaft sprockets, thus causing the engine to be out of time. Depending on which teeth jumped, how much they jumped, and in which direction, you may notice a difference in performance. This could be the cause of the stumbling or sluggishness. The first step is to check the sprockets and see if the timing marks all line up. If they do, then your problem probably lies elsewhere, but if the belt has been neglected, it would be a good idea to repalce it and the entioners as soon as possible.

It als wouldn't hurt to check the ignition timing and make sure it is in spec. This is adjustable on the 91-92 models, and there is a procedure for doing it correctly.

Hope this helps. If anything, checking these things can narrow down the possibilities.

[bumpn]

i have replaced the iac and the ptu with still the same effects...since you mentioned the t belt i wen ahead and pulled the cover off of the front bank and the marks look pretty close to lining up with the pointers atleast on the front bank so i have no idea if it is necessary to look at the rear bank or not.. usually when i start my car up when it is cold it will idle about 1700 rpm for about 3 or 4 mins before it finally starts dropping down til it gets to bout 700... i dont know if this is normal or not for this type of car... as far as it missing and acting sluggish i think i got nost of that out as i have ran 3 bottles of injector cleaner throught it mixed in just one half tank of gas but i still get a real high idle on start up...