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That seems normal. Smaller tires (shorter) than designed will increase rpm, and larger tires (taller) tires will lower rpm. If there stock diameter now then your fine. The Rev limiter will protect the motor if needed.
Oil level normal, when engine warn up, low oil press light came on at low speed unless raise your rpm up a litter, light will go off. What is wrong & hoe to correcting?
Check your I A C motor (idle air control motor) Check all your hoses and tubes leading to and from. Check the throttle linkage itself to make sure nothing is obstructing it from returning to normal rpm,
NORMAL JUMP AS THE ENGINE RPM INCREASES THE OIL PRESSURE GOES UP VERY FAST. I HAVE THE VAN, MY DOES THE SAME THING, U CAN TRY REPLACING THE OIL PRESSURE SENDER, BUT ONLY USE THE GM ORIG PART, AFTERMARKET ONES MAKE THE FLUCUATION WORSE..
It is perfectly normal for the idle speed to increase with the AC on. This is done to ensure that adequate coolant flow is available for the increased strain the compressor puts on the engine.
If the idle increase is too high, there is a safety problem. There is an idle adjustment that can be made to reduce RPM to factory specification when the AC is on.
Check the large hose leaving the brake power booster (under the hood, directly in front of where the driver sits, large round diaphragm). That hose will run into the top of your engine, it may be off, or the hose may be cracked.
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