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oil light is flashing at Idle. Oil is full.  What are the possiabilities?

my 92 s-10 blazer 4.3l throttle body has the check engine light on and the oil pressure guage is reading low (at the lowest point on the guage). the oil level is at the full mark on the dipstick. as i am driving and accelerating the pressure rises slightly and the light flickers on and off.(check engine light) there is no difference in the performance of the motor and the gas mileage seems to be the same. could this reading on the guage be a problem with the pump, oil sending unit, oil pressure switch and how can I properly diagnose the problem myself? and should the vehicle still be driven before diagnosis? thank you in advance for your response.

Full of Oil, the dash light check guages, and oil pressure guage goes to zero. If you let up un the accelerator petal it stops. for a few minutes.

hi i have just built an 1998 camaro engine with the v6 3.8 series 2 engine and i dont have oil pressure when i turn the motor over no plugs or coil wires pan full of oil. i need to know what to do i have not started the engine yet because i am afraid it wont build pressure and lock up. this oil pump is the gear type in the front cover driven by the crank. i have the filter full of oil and have put a mech. gauge in the sender hole with no avail. should i go ahead and crank the engine and get pressure from the rpms or what?? lost need knowledge……..pdt81@YAHOO.COM THANKS IN ADVANCE

OH ALSO I PACKED THE PUMP WITH VASOLINE LIKE INSTRUCTIONS SAY….