A little help, rough to low idle???

Digging out the beast for preparation this year and all is well except after about 3 minutes of idle time, just about when temp light goes out, sled just almost dies right out. Like isles at 550 to 600 and barely keeps a float. Last year, last ride before storage I had an ecu code 26, intake manifold pressure sensor malfunction? Checked the lines briefly but they seem fine. Sled has Evo 210 flash for 91 octane. Just added new fuel, fuel was new last year, got good fuel pressure via my aux gauge.

Just looking for some help. Plugs are CRB9E gapped .20 and new last season.
Maybe something I’m missing or not picking up on but kinda frustrated and it’s preseason!!!!

Thanks