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you don't need seafoam. What you do need to do, is open your intake at the throttle body and spray carburetor cleaner in as it runs. This will clean out your whole emission setup. Next thing is check your timing and make sure its correct and even retard it some.Replace spark plugs, cap and rotor, if need be. Also make sure your EGR valve is functioning. You can do this by holding your finger on the underside and revving the engine. If it works it the diaphragm will pull up. Also definitely get a good cat and run the engine at 2800 rpm for like 10 mins straight prior to putting it on the rollers to heat the cat up.
If your o2 sensor was bad you would be throwing a code.
I just took in a a higher mileage 89 that had failed and gross polluted 3 years ago and sat since then. I got it to pass flying colors running real clean. I pretty much did all of the above to do it.
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