MSefi.com read only forum (Jan.15,2018)

Could you assist me with your expertise? I'm running an MSII on a V3.0 board to control fuel on a mildly warmed over 454 in a 1988 C1500.

Current tune is attached. Idles great - stumbles while accelerating - runs okay in cruise...take a look at the log (next post) and you'll see what i mean.

Engine specs are below:
-1988 454
-Peanut port heads
-Edelbrock TBI manifold
-454 TBI
-Erson cam - 270/280 (204/214 @.050; .476/.501 lift; 112 LSA) going for low end torque, it''ll be my daily driver
-MSII controlled HEI, initial timing 16 degrees
-1.75" long tube headers
-2.5" true dual exhaust with H tube

Datalog from earlier today.

It looks like a jittery MAP signal triggering too much acceleration enrichment; try setting the tune to 100% TPS driven AE, and check to be sure the MAP signal is plumbed to a good spot.