intermittent code 45 on 88 Chevy 2.5 liter

1988 CHEVROLET CELEBRITY
189,000 MILES
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MWXJ98
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once a week or so the ses light comes on the goes off. it will be a little rough at idle before it comes on. when i look over the car it runs perfect. in the last 2 years Ive change out or rebuilt the fuel system,all but the coils in the ignition system, good on regular maintenance. blow the upper rad. hose and lost coolant and was told the temperature light didn't come on. cant find any spec to check any of the sensors on the motor with a meter.
Jan 2, 2012 at 11:40 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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