How do I diagnose service engine soon/ABS lights on 96 buick regal gran sport?

Blake

New member
1st time I took car into shop they could find nothing wrong with it. The car has 173K miles. I'm getting codes P0300 and P1361. It stalled on me twice in a month before taking it into shop a 2nd time. I just had a tune-up done last week with new plugs/wires and new catalytic converter/muffler. The service engine light will blink periodically when I'm driving and I will lose acceleration. It has not stalled since but is running pretty roughly at times. I can feel the car jolting sometimes when I drive. What do you think might be the problem? At Autozone they thought my fuel injectors might be bad. Other possible causes listed were open or short circuit, failed ignition control module, ECM failure, vacuum leak, or high/low fuel pressure...Please help.
Car seems to start fine everyday. It has a new battery and alternator.
 
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