spark plug issue. gapping? fuel mixtue?

[RPSil13]

car: 87 turbo auto

so i am having an issue w/ my spark plugs, its misfiring and fouling my plugs,

backstory: car sat around a long time, drained 99% of all the gas, then put some fresh 91, when started car was misfiring, checked plug gap, it was at 0.041, whoa, way to big so i brought it down to .031, then the misfiring got worse, switched over to some bosh double plat plugs, also gapped those to .031 still having issue, when i pulled those plugs they were all black, so then i put in some ngk plugs, ungapped at .035, it was running fine did a few pulls around the block, and the misfiring started up again, pulled the plugs and this is what they look like, then i gapped them at .031 and the misfiring got worse again, aaahhh what am i doing wrong, also my boost only reads 5 psi, im not sure if this is stock boost for an auto or if i may have a boost leak but not a 100%, someone please help

couldnt get a good pic but all the plugs are white

 

[RPSil13]

NEW INFO:

just checked the timing and it was WAY OFF, it was like -20/25 BTDC, i was able to get it to -15btdc (the most it would turn), which really helped, now most of the misfire is gone, theres just a very slight misfire, im assuming this is b/c the current plugs in there are fouled, right?

 

[black91turbo]

Do you have a stock DP? If not you have a serious boost leak. Having said that, even with a stock DP you should see more than 5 psi....closer to 8 if my memory serves me right. As far as your plugs go....I would recommend using the NGKs and checking your timing. Have you checked your codes? If not...start there.

 

[black91turbo]

NEW INFO:

just checked the timing and it was WAY OFF, it was like -20/25 BTDC, i was able to get it to -15btdc (the most it would turn), which really helped, now most of the misfire is gone, theres just a very slight misfire, im assuming this is b/c the current plugs in there are fouled, right?

Timing should be set at 12 degrees.....I would put a fresh set of plugs in it after you set your timing correctly.

 

[jetjock]

Not to be picky but the spec for Initial Timing is 10 degrees...

 

[RPSil13]

yeah the max i could set it to was b/w 10 and 15 btdc, so ended up right around 12/13 btdc,

no codes, and an hks dp,

ill prob get new plugs tomorrow, again

 

[grimreaper]

something isnt right then. 10* should land right near the middle of the adjustment for the cps.

 

[Poodles]

Off a tooth would be my guess...