94 LT1 in a 90 K-5 Blazer

ok, when cold, it is fine, but once it warms up, the engine stumbles and it sets a code for High Res Pulse Failure, I checked all the wiring and all looks good, no corrosion, ect.

if I let it cool off, the code and stumble stay away until it warms up again

sound like the opti?

 

Opti or maybe a poor connection with the wiring harness (corrosion, etc.).

 

all the wiring looks good and it all checked out ok, I just got the flow chart, I am going to go through it tomorrow and if it points at the opti, I guess i will open it up and see if I see anything, if not, it will get an opti I guess

 

ended up being the opti, i pulled it apart, and it was full of rust and had major play in the bearing, runs great with a new one