I swapped in some MSD 8.5 superconducters, but I also swapped in an old cap and coil off my 85. the cap and coil worked fine in the 85, but after the swap, the 82 will idle fine, but if I try going it the car will only run on 6-7 cylinders and pops out the exhaust real bad. the tach jumps around like crazy. I bring the engine up to 2000 rpm maybe and the tach reads from 3500 to 4000..
I just bought these msd used and i'm wondering if i should be yelling at someone cause they ripped me off.

but the funky tach makes me think coil...

------------------
WHO NEEDS VTEC? I HAVE VORTEC!

1982 Camaro "VortecZ"
Vortec headed 350 bored .02 over, comp xtreme cam, edelbrock 750 carb, edelbrock performer rpm intake, dynomax 1 5/8" shorty headers, accel ignition, stock TH700r4, powertrax locker, 3.73's

1985 Z28 stock LG4/700r
T-Tops, A/C, soon to be modded.

 

Bad wires will cause a backfire, Check to make sure they're not laying on the headers, this happened to me. I drove around for a month with a backfire until the car warmed up. I checked the #1 plug and it was completely burnt through.

------------------
'86 IROC
T-TOPS, TINTED WINDOWS, BRAKE LIGHT BLACKOUTS
GM GOODWRENCH 350
EDELBROCK TES HEADERS
FLOWMASTER, NO CAT
EDELBROCK 600CFM CARB.
KN AIRFILTER
ACCEL HEI DISTRIBUTOR
160* Stat
2:73 GEARS
Rebuilt 700R4, with manual valve body
B&M Megashifter, 5" Autometer Tach w/shift lite
Soon to be installed
3:73 Richmond Gears and 3" Hooker Aero Chamber
Corvette Servo & .500 boost valve
15.61@ 95.2mph G-Teched, 1-2 shift slippage, and just replaced a burnt plug wire
"There is nothing more addicting than speed"

 

hey man, check your wires to make sure that they are in the right place on the cap. My friend and I did a carb/distributer swap and he mixed up 2 wores, and brought about the same condition as you're talking about.

------------------
'86 IROC 5-speed
305 LG4
edelbrock performer rpm intake
edelbrock 600 cfm carb
msd pro billet hei
'95 3.23 rearend
hotchkis rear suspension

 

yea that was my first thought, crossed wires.
it runs like it gots crossed wires too.
I checked all the wires with a timing light and they all flash nicely and consistantly
weird!
I'm gonna swap cap and coil anyway since i got the msd 6al and blaster2 with the wires. hopefully it will all work out *prays*