93 Sputter and stumble problem

[samauriwarrior]

My 93 LT1 starts up fine. Runs rough, Sputters a little when cold and then when it warms up it gets rougher. Occasionally it will backfire. Not bad but noticeable. The backfire appears to be only on the right bank. I changed spark plugs (Cheap Bosh ones) and replaced the O2 sensors (Bosh). It does not throw any codes.

Had some experienced mechs at my place of business check out the fuel injectors and they were fine. The mechs seem to think based on the rough idle and a smell of fuel that it was the Opti going bad. My question is this...Would an Opti going bad only affect the right side?

[c4c5specialist]

EXACTLY, how do you KNOW the Optispark or the injectors are bad??
It would be suggested to take a resistance reading of each injector.
16.5 ohms is what is the normal spec when the engine is cold.
They shouldnt vary more than 1.0 ohm.
Give that a check first.
Also, do NOT use cheaper aftermarket parts, they will always create problems.
Allthebest, c4c5

[TheRobSJ]

Just to add on, just in case you're check the resistance with the engine warm...resistance shouldn't be lower than 13 ohms. And you still don't want a variance of more than 1 ohm between them all.