My 1992 3.2 petrol trooper starts an idles fine

diesel motor parts and petrol motor parts are not rely compatible ether use diesel to diesel and petrol with petrol

R u start the car in cold morning or any cold condition? If so, it is normal revs up itself. Sometimes I see some cars revs up to 2000 rpm for 2 to 5 mins, then drop down to 1000 rpm.

Check glow plugs and valve clearances, both of these will cause bad cold starting, but once hot will start fine

Sounds like an Idle Air Control (IAC) motor to me.

i will recommend you run a scan on the car..

G'day
I dont know if this will help but i had a similar problem with an isuzu sbr and after doing all that you have done i took the fuel tank off and drained it. Every thing looked fine so i washed it out with a little bit of petrol and a small piece of clear plastic came out. What it was doing was floating up when the truck was not running but after i started the truck it would slowly get sucked down to the outlet and block the fuel line.
It was very frustrating and it took me quite a while to find the problem.
hope this helps.

Check make sure all plugs are firing. Sounds like what my 93 Rodeo was doing-Idled okay but very rough when in gear. Turns out only 5 out of 6 plugs were firing due to a defective ignition module- 100 bucks later it works fine.

Hope this helps.

when my mazda mx5 is warmed up the engine idles at 800 revs after about 20 seconds the revs drop to 400 revs,after 5 seconds they pickup again to 800 revs,this pattern is continuous.HELP!!!!!

The usal trick is to fit the diffs from a petrol fronteria of the same year as they are lower geared cos the petrol revs higher .
A couple of minutes after a long run is good .

i suspect the throttle body has lost its basic settings for some reason,ive only known of that happening a few times tho,but that is the symptoms of a throotle unit,plug in a scanner check the codes and reset the throttle body in basic settings