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Q: why does my check enigine light flicker when i hot the brakes on 1990 Oldsmobile 88

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
as of 2 days ago the check engine light will flicker and if i do not let off the brakes the engine will die it seems like a electrical issue as the speedo drops rapidly and the aftermarket radio cuts out loosing memory of what station it was on as if i had unhooked the battery some times the car will cut out momentarily then go on while going down the road and i may be mistaken but after said episodes the exhaust smells like it is running richer so is it a sensor a bad ground causing back feeding from the brakelights , a faulty ecm any ideas? oh and the car started this monday night 9-17-12 then didnt act up again til this morning thursday 9-20-12
(2) Answers
CHECK BOTH BATTERY CABLES VERY CLOSE TO SEE IF CLEAN AND TIGHT.
POS.(+) CABLE GIVES A LOT OF PROBLEMS AS IT HAS TWO CABLES HOOKED
TO IT! JUST SOMETHING I HAVE SEEN IN THE SHOP. DO YOU HAVE ANY STARTING PROBLEMS,OR ENGINE TROUBLE CODES? IS BRAKE PEDAL HITTING ANY WIRES WHEN DEPRESSED? ANY WORK DONE ON CAR LATELY? ANY AFTERMARKET ADD ON EQUIPMENT?

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