for what its worth, i have an 88 5.0, it has a modified truck upper and lower, ported stock heads, long tubes and free flowing exhaust. this thing no longer has any, thats any at all emissions on it .no smog pump , no egr , no anything , it has only three vaccuum lines to it, just the bare requirements. it hunts for idle for about 10 sec. when starting up, after that it runs perfect and strong. and gets good mileage.
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