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There is an adjusting screw on the throttle body, you need to dial the screw in slowly until you golf ideals at 900 to 1000 rpm. Try this first before you look at your timing.
Just start it like normal and when the revs start to sound distorted start accelerating
check all the rubber pipes from the injection unit to make sure there ain't no breaks if they are ok then it will most probably be the idle air control on the injection system buy a can of carb cleaner and take the pipe off and spray a good bit of carb cleaner into the valve whilst someone keeps the car running it worked for me.
Check coolant level
May have a factory installed rev limiter
When mowing it will idle up and down because of the amount and thickness of grass you are cutting. This is because the blades will struggle cutting thick grass so the engine needs more revs to keep the blades running at a constant speed and that is also why your mower may slow down because it has used the majority of revs to cut the grass and their are not many revs left to keep the wheels spinning The up and down revving could also be caused by a dirty/clogged air filter.
The powertrain control module will start cutting back on the fuel if the engine revs are going too high
well that happens to me an it means fuel is low
air box issues
i have exactly the same problem by the sounds except i classed it as 2nd revs, and mine was a kia sportage 2001, the a/c belt broke and it began. i have replaced the belt but the revs (diesel engine sound) is still there. if you have found an answer please look for kia sportage 2001 4 door and let me know whats wrong:( with our cars
Revs - video game - was created in 1984.
Revs - video game - happened in 1984.