idle surge?

[1987coupe]

i have a 87 4 cylinder coupe that i converted to a v8 with mass air. it has stock bottom end with performer heads, 1.6 roller rockers, e cam, street heat intake, stock 19lb inj. 70mm tb, c&l pipe with c&l meter with a 19lb sampeling tube, mac long tubes xpipe flowmasters.

I cant get the thing to idle ( up then down then dies) and it has a dead miss when you rev the engine to about 1500 to 2000.

If anyone has any ideals let me know thanks!

[red srides]

:lol:runs like 350 chevy with a rod knocking going down a hill:lol:

[red srides]

my bad i meant to say this coupe will BUST my carbed 4v's ass lol

[rush88GT]

check the idle air valve, and the wires. Then check the tps

[1987coupe]

which wires?

[rush88GT]

At the bottom of the Idle air is a connector. They tend to work themselves loose. I had a similar problem. It turned out a wire was shorting out on the block.

[1987coupe]

oh, ill check it out thanks

[03z06vette]

dead miss?? isolate the miss i bet its plug or wires.

[1987coupe]

just put new plugs and wires on sunday, the miss goes away when you are above 2000

[INSANEBA]

Does it have an msd box? I had one go bad on a small block s-10 I had and it would miss from arounf 2800-3400 then clear up. As for the surge, deffinitely check the iac valve

[1987coupe]

it has stock ignition but i will check the iac tonight

[red srides]

my bad i meant to say this coupe will BUST my carbed 4v's ass with 7 plug wires offlol.....................

[1987coupe]

changed the iac, checked the wires, nothing wrong so for s&g i changed the air flow sensor. that helped the idle out a bunch but it still has the miss

[Stang88]

My Stang had a miss at 4k rpm and turned out to be the distributor cap/rotor. Did not have any cracks in cap or anything. Didn't ever know why. I had replaced plugs, wires, iac and everything before the dizzy cap/rotor. Didn't think it would wreak that much havoc, but it did.

[mike94stang]

if the miss is only at idle, check for vac. leaks, check all vac hoses, plastic fittings, etc. use a spray bottle of water, u can spray the wires down at the same time and look for some sparkage. not to insult, but could you have overlooked a dropped plug? (no gap)

[1987coupe]

checked and replaced all plugs gaped them at 40 checked for vac leaks nothing

[dynawideglide01]

KOEO,KOER codes?Cylinder balance test?Base idle reset?

[1987coupe]

how do you reset base idle and check codes?

[adragon72]

my car did the same thing, i checked every thing these guy are telling you, and found it would get a little better each time i messed with it. i replaced the IAC,vacume lines, vacume fittings, mass air meeter, you name it lol. but the last thing i replaced was the ICM on the side of the distribiter. the one i had was new so i never checked it.

the things these guys are telling you to check are the most common, find you a buddy and borrow his ICM for a few min and see if it helps good luck.

[cobra429boss]

I say its the pickup in the distributor