I posted that my car failed two smog checks on another thread and now I find this. Plus my car is shaking a little what could be wrong any suggestions?

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Black 91 Z28, L98, 4L60, Dual cats, Posi.
Mods: Slp shift kit,B&m tranny cooler,B&m 3-4 upshift kit,Performance distributors HEI Dyna module,Msd 6a,Msd 8.5mm wires,k&n air cleaners,Home made air induction,Modyfied Mat,Hypertech power coil,Hypertech 176/166 fan switch,Flowmaster cat-back exhaust,dual dynomax super converters,160 thermostat,Tb bypass mod,Tb air foil, KYB's.
Red 79 Z28 with lots of mods.

 

code 42 could mean your ignition module is going south. might want to take it off and have it checked. new ones are like 35-40 bucks if i remember right. however, when my tpi corvette threw a code 42, it wound up being a bad computer, but my car wouldnt hardly run when it threw the code. when the check engine light wasnt on it ran perfect, but the light came on 90% of the time after it was started.

 

I tried a new ignition module same story. I might go and have them tested just to make sure. I just put in a rebuilt computer not to long ago, I'll swap in the old one to see what happens. Thanks for the advice.

 

Bet it is the computer you put in. That was my thought after reading your first thread. Now that you said you put a rebuilt one in recently I would bet that is it.

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87 TA, 305 TPI, Custom CAI, ACCEL 8mm wires,ACCEL Super-coil, ACCEL Plugs, JET TPI Airfoil, Cherry Bomb Muffler
"35 yr old helo pilot
with a cool new toy my 17 yr old son wants"
The Phoenix Project..click to see my project car
Trans Am stuff and GIRLS, GIRLS, GIRLS!!!!!

 

man it is the spark timing circit. it is not the module. it is most likley a short in the wires jiggle them arround and see if the light goes off. if yes find the short and splice in a good wire. if it does not go off there is a problem in the distributor with the spark timing circit.

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90 IROC l98
last season best corected 13.62 @102
mods
full exhaust, AFPR, pulley, jet stage 1 chip, billet servo, 52mm throttle body, slp runners and some 1.6 RR's and a few other little things.
243 RWHP and 342 RWTQ with hot engine and 90 octain fuel