slow93z

so i have changed the optispark,plugs,and alternator do to low voltage output. but yet i still have a mis only at light throttle as soon as you start laying into it it goes away. just only when cruising or not accelerating. does anyone have any ideas what this could be? also ran a vacuum test and it has plenty of vacuum so im not thinking vacuum leak

robsquikz28

iTrader: (246)

what plugs are you running?

are you sure the plugs were not broke when you installed them?

I wil say you have bad plugs that are causing this.

slow93z

im running the AR 3910 plugs. and no i didnt crack them putting them in, didnt drop them or anything.just put them in a couple days ago.

tonygarcia1990

any ses light on ?? u check fuel pressure ?

KAMSVT

im having the same problem but i also have a high idle. (1200rpm) after an ac delco opti replacement at first i thought maybe the opti wasnt alighned properly but mines a 97 no splined gear. ive seen in other threads were people put them in off a tooth and the timings off. just a thought

does yours idle high?
keith

slow93z

no ses lights. and havnt checked fuel pressure. if you dont align the teeth right it doesnt sit flat across the face of the timing cover so i didnt do that. im wondering if im running to cold of a plug? i dont know to much about all that. the plugs that im running were recommended to me.

KAMSVT

What mods do u have that u need a colder range plug? not to push the miss alighnment but people have been 100% sure they got it right and ended up being wrong . is yours idling high or normal?

slow93z

just ported heads and cam. higher compression. i just hit the bottle everyonce in a while and was told to run a colder plug if im going to be doing that.and no doesnt idle high. idles normal