weak spark on 2 cylinders lt1
 

first fire up was this week. yesterday i got.my y pipe hooked up and it sounded great came.back out awhile later and i notice on its next.fire.up it was running.rough. i found two cylinders had a weak spark compared to another spark plug i pulled out. am i looking at getting a new.opti or else?

Re: weak spark on 2 cylinders lt1
 

Check resistance in your plug wires, or you can switch plug wires to see if the problem stays with the wire or spark plug.

Id also re-check the plug gap.

Re: weak spark on 2 cylinders lt1
 

Maybe.the.plugs.sucks they are new

Re: weak spark on 2 cylinders lt1
 

Ok so i have moved around my spark plugs and spark plug wires moved my injectors and changed even my opti out to still have the same problem. this lt 1 is about to be thrown out and a 383 carb go in

Re: weak spark on 2 cylinders lt1
 

I got a code p1361 low voltage to control module.anyone get that and what was the fix? i just ordered a new msd coil.do i need a new icm? anyone?