Ah, the dreaded 3.4 spark plug kaphlewey. Not the first time it's happened. Your caution ironically was part of the cause!!!
FWIW, after I cleaned up and tweaked my 3.4, Mike Caskey told me the spark plugs were not properly tightened. Funny, I THOUGHT I put them in like I have done every other one for 30 years... Mike saved me a disaster.
Heb Dduw, heb ddim; Duw a digon
I'm that gun-totin', farm-raised, evangelical, pro-environment, OHV ridin'/drivin', Southern civil rights pro-labor Liberal yo' momma told you couldn't possibly exist.