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

on idle when gased it pings sounds like its coming from intake manifold...

Asked by for the 1991 Toyota Celica
1 answer
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?