My 1990 Iroc 305 TPI 5 speed has developed this stuttering and what feels like a misfire. It stumbles (not all the time) from idle, but at about 3000 RPM it just doesn't want to make spark it seems. It misses. I just put on new plug wires, the distributor cap had some nasty green crap in it that I tried to clean out as best as I could. It seems my car eats up distributor caps. This is my third one in four years. It always gets a carbon build up like that. Is this the problem?

 

have you checked the coil pack or did you replace them as you replaced the caps?


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85,z-28,t-tops sbc 333CID 5.5 liter
harwood 6inch z-28 outlaw cowl pin on hood
MSD 6AL and MSD pro-billit distributor
soon holley 800cfm.carb. eld. victor jr. intake 1" taller,port matched, 1" spacer,
cast iron dobble hump heads 2.02 1.60 valves
53cc ported&polished
hooker headers 1 3/4 prim. 3inch collector full length
solid roller lifters 8620 billet cam @050 246 253 .585 .600
proform gear drive timing
forged egale SIR rods
trw forged flat tops
th400 tranny 3000 rpm stall
spohn proformance th400 crossmember and torque arm
spohn drive shaft
waiting to install spohn sub-frames
true dual 3 inch with 40 series flomasters exiting in front of rear tires
stock rear for now 3:23 gears 13.702 @ 106.18 in 2nd gear

 

I went ahead this time and replaced the coil, so far so good... Thanks for your input!