1998 Holden Rodeo TR series 5-speed manual 2WD

Question edited for clarity and terminology.

You never need to take the engine out. It is normally done from underneath with the car on a lift.

https://www.google.com/search?q=1994+Holden+Rodeo+TF+2.6.+How+to+replace+starter

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Careful cutting through the fitting

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Hi Jim I see someone else has requested more information i am unable to find your reply. When does it rev high and low? if it is when the vehicle is stationary ie stoped at lights at idle. Bare with me i had one with the same fault, it took a while to sus it out simply because of what was causing the fault and would not have found it without connecting Tech2 (diagnostic tool) this gave me the information required to locate the fault. now it may not be the fault but it may be worth checking A shot in the dark !! Check the power steering switch from memory left side (passenger side) down low of engine just able to be accessed. check for a high resistance ie poor connection /dirty connection / pinched or damaged wire. If this does not work would advise Holden dealer a Diagnostic scan should be carried out. Good luck

http://www.ebay.com.au/itm/Indicator-High-Beam-Stalk-Switch-Rodeo-TF-1988-97-Holden-TFR-TFS-Blinker-Turn-/261941117019

it will be on the indicator stalk from the part link above. probably pull or push the stalk gently forward or towards you .

fuel injected or carby.

Spray aero start around manifold while idleing. if revs pick up there is a leak. repair the leak

Have a careful look at the compliance plate. It's possible the 3 looks like a 5. The 5 speed transmission may have just been put on. Sure enough GM stopped manifacturing KBD42s in 1983.

This sounds like the TPS. Thottle Position Sensor. This controls the idle. Your local Advance Auto Parts should have this part. It should not be that expensive.

vacuum leak......bad tps.......bad mass airflow meter system........any of those are suspect...... also check for bad ground at battery to be sure all is not computer freak out from bad readings ...good luck