i seen that it was wet & black when i first started to fix some problems and after they were fixed i seen that the plug was still the same ,it sparks when i had it grounded iam thinking its in the heads (#8)wet

 

Check compression. Sounds low on #8. What have you done so far? What engine is it?

 

nothing yet .but i plan to pull both heads today .i bought the motor from a junkyard about a year & half ago sence then i've replaced fuel-injectors ,fpr ,both fuel pumps because they were shot, i still need to replace the timing chain ,it has a lot of slack. i should have done this when i put the motor in ,after all of this ,the motor still has a bad miss, so i was going to do a compression test when i seen that the plug was wet & black .so i grounded the plug and it was sparking .so i ask around ,they told me that i might have a stuck or burnt valve .so thats when i came to my favorite site .i have a few threads that has helped me considerably and theres alot of knowledge here!!!!

could i have carbon built up on the valve(s)

94 f-150 5.0 xlt 2x4

 

Carbon buildup is definately a possibility. I would also go with a burnt valve too, hence the compression test. Does your motor use a lot of oil (burn not leak out) ?
That would be a sign of bad rings.

 

no it dont burn oil . it does burn your eyes whilethe motor is running

 

i check my compression my results are:
#1) 153 lbs wet plug
#2) 150 lbs
#3) 173 lbs wet plug
#4) 164 lbs
#5) 145 lbs
#6) 158-160 lbs
#7) 163 lbs wet plug
#8) 155 lbs wet plug
all plugs are firing

 

does anybody know the compression range for a 302 need help please

 

please help me

 

without being exact - you want to shoot for no more than 10 percent deviation amongst cylinders , i didn't see a wet test posted for your compression check , do the compression test again but squirt about a teaspoon of motor oil in each cylinder and see if your compression comes up - if not i would suspect worn valve guides -

 

i just went ahead put the motor in the mechine shop, had a lot of carb build up on the valves, bored cylinders 0.30, i also had abad rod ,crank was grind 10m,20r. now iam just putting it back together . cost about $1100.00 for mechine work and kit