After adding a quart of oil, I forgot to repace oil cap - on 1992 Toyota Corolla

As I was driving on freeway, I get a loud POP from front right side of car and smoke and lose of excelaration... my husband added oil and new cap, but engine runs ROUGH and my idle is barely there....no leakage though or smoke when driving it home....what do you think?? head gasket?? lifers??

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1 answer
YOU MAY HAVE OIL CAUSING PLUG WIRES TO SHORT OUT. PRESSURE WASH ENG AND TUNE MAY BE YOUR ONLY ISSUE.