Just bought new car, misfire help

[mattfoo83]

just got a 91 mtx. had a very bad misfire on the drive home 0-60 in 3 miles! got home, at night, noticed spark under the rear of the intake, removed upper intake, found 2 plug wires not fully on spark plugs. the first one pushed down great and mated with the valve cover. the sec left a small gap between the cover and wire boot. this plug with also was discolored like water or steam had been in there for some time. i havent quite gotten the hang of the test where it checks each cylinder. now it seems to be down only 1 cylinder. starting it with the #2 wire off doesnt seem to change much.

should i just replace the wires and plugs and go about my busness or should i be worried about this further.

its a 91 mtx with 135k on the clock, im a ase certified mechanic by trade but want hints on what the SHO gods think. im always up for learning

 

[bubba]

pull your codes to helps to find out what it is. it could be the coil or DIS causing this too.

 

[mattfoo83]

with the plug wire off the spark plug it sparks like crazy

no codes other than p/s pump being out of fluid

 

[itwonder]

Blow out the plug wells and see if there is any water or oil down in there. Oil indicates time for new valve cover gaskets. I'd go ahead and put a new set of wires on and replace at least that one plug.

 

[mattfoo83]

ummmm whats water mean? not alot butr 2 plugs where blacked out (not firing) and had some rusty water in there.

whats a normal compression check (psi) read?

 

[mattfoo83]

ok figured that out...... now im down only on #5. im doing plug wires in the morning will update on that. hopefully that pics #5 back up

 

[mattfoo83]

yeppers that worked runs on all six, runs good. now i get to start buying mods