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I have a 89 camaro rs that runs fine at idle but going down the road you here a slite ping like when you run cheep low grade gas then the cheak engine light comes on then you lose power to about 1/2 but as long as the engine light is on there is no ping.I have spent 500 dollars on sensors not yet fixed problem can any one help???
 

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What is the ignition timing?
 

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a clogged cat will make it ping as it will increase internal cylinder temp because of not letting the exhaust out...can you get it scanned???that would be helpful in the diagnosis...
 
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