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Q: engine lacks power on accerleration and pings on accerleration on 1991 Toyota Celica

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
on idle when gased it pings sounds like its coming from intake manifold...
(1) Answer
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check oil level, and check EGR flow. Also it could be a misfire. Misfire would cause pinging as well as lack of power. Does the car back-fire?