Hey all,

I have a '95 S-10 with the 4.3 TBI. First thing in the morning, the
truck seems like it's missing on one cylinder. The funny thing is
tach also acts very erratic during this time. While the engine
hesitates, the tach does not show the hesitation, but does behave
erratically. After about five minutes of running, everything smoothes
out in an instant, the tach works fine and the truck runs great all
day. It's happened two mornings in a row now, and both mornings have
been a little damp. I understand the tach hooks to the ignition
module. Any thoughts?

Russ