An 88 w/ a CPS, hmmmmmmmmmmmmm.
Best to replace the exhaust manifold before you burn a valve.
You don't say time/ miles for these changes. Where you are re weather/ temp.
1) Oil filter, oil, just wear. Maybe sensor? Some of mine do this; some don't.
2) I'd do a flame trap & throttle body service for a start. Have you gotten some bad gas?
3) Again, how long & how much driving? We had one w/ slap noises for 50K+ miles that would sometimes seem worse, then batter, .... a friend has it and is still driving it several years later.
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240s: 2 drivers and some parts cars
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