Only had my 1993 Sportrak for a month or so.
Problem started as a dip in power at 3000 rpm, with the engine returning to idle speed without cutting out. If you keep your foot on the throttle then the revs would climb pack to 3000 then dip again and so on... Resulting in a bumpy ride!
The problem now occurs at idle, and I'm unable to get the revs above 1500 rpm.
It's in the garage but all I get from them is that the engines are usually fautless - not this one!
Any thoughts appreciated, I really miss it!