I recently did a tune up
How recent is recent? And how long is 'awhile' that it ran great?
Like Fix Until -, I am interested in what this tune-up included. Did you otherwise open up the cooling for an unrelated reason? Is this overheating something you watch on a gauge, or do you just have an idiot light? Are you losing AF?
\'96SS SOB: SSRI, Herter Tune, Tri-Y II, , 3000 Edge, F/HO bars, METCO extendeds with CV MMC, Bilsteins, currently Vredestein Ultrac Sessanta (315/35 rear)
\'96FWB BUW-Butt Ugly White: PCMPerformance tune, HomeDepot pipe w/ swissed filter, 1/2 SLP s.s. catback with H- and Flow Super 50s, oem opti rebuilt 3 times, SS Bars, METCO LCAs, Airlift 1000, Monroe SS, PowerTrax No-Slip, and now CTS wheels with +1 rubber. Finally, wait for it... LT-4 knock sensor!