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If the engine is surging fast and then slow every few seconds it is most likely the air mass sensor MAF. It is sited on a collar on the air ducting just after the air filter box. Start the engine and leave it it to idle. To confirm the diagnosis there is a simple and free way to check.Start the engine and then disconnect the plug to the MAF. If the engine now begins to idle evenly (it might be faster or slower than usual but no longer surging) this indicates that it is the MAF at fault.
very likely your idle position sensor is bad. i would start there . are you showing any check engine lights on the dash? if so check which codes are showing up first as it could be other things as well like a dirty or bad MAP sensor or filiment, crank position sensor etc. ggod luck. the idle position sensor is fairly cheap and easy to replace if you have some basic tools.
1.Verify that the cooling system is full of coolant and there is no air in it. 2. Remove the air boot from the throttle body and cover the throttle body with something that will stop the airflow . the Fast Idle Valve is the problem.