Shawn Engelhardt

1990 suburban tbi 350 2500 2wd throwing code 42 ESC module. Everything I seen talks about truck not starting or stalling. My truck runs idles a tiny rough and don't like shift. Have to peddle it to get it to shift. If engine light dont come on which started to pop on randomly I could shut the truck off start it back up no light sometimes have to do it a few times but pretty much on fulltime now it runs and shift like brand new. Any ideas where to start?