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Haven't worked on it in 2 weeks. My Trans Am had close to 400,000 on the original engine. My dad had over 300,000 on his 1970 Corolla before replacing the engine and racking up another 200,000. It's all about maintenance. I'll post some pics when I pull the head.

Checked that when I pulled the plenum. It appears to be fine. I'm going to tear down the head. I'm leaning towards valve seals since I haven't seen anything else that could cause this issue. The engine has 245,000 original miles and I know they've never been replaced.

I have a 1994 Corolla DX with the 1.8l engine. Engine has run fine up until about a few months ago. Full tune up was done end of last year. I pulled the plenum off and found that there was a 3/16" coating of oil inside, bad enough to block the vacuum port for the fuel pressure regulator. I...