TBI issues

[L&L70]

Need a little guidance. Not sure where to start trouble shooting. Even though it's an 87 I figured the TBI crowd is larger here. 1987 chevy half ton 305 TBI. Running smooth as butter than all of a sudden developed a horrible stutter under load. Sometimes it's half throttle, other times it's immediately off idle. Went ahead and tuned her up with plugs, wires, cap, rotor, fuel filter and just now a ignition control module. Old one failed after 3 or 4 passes with a low rpm fail? No noticable changes in condition. It's also failing to start often. Might be able to figure it out over the weekend. Also parts store didn't see any codes. Thanks ahead of time.