1994 suburban
So need some help. Just rebuilt a 350 and having some issues. The motor is 60 over, had L98 heads, dual plane intake, with a summit 1102 cam. 278/288 lift .421/.444.
Im running with the stock tbi. When driving it's fine under normal excelleration, but it bogs under harder excelleration. At about 55 I'll try to downshift and speed up and it backfires through the tbi. Any idea what to do to fix it.