Due to its location, the optispark is subject to moisture from several sources. First, driving through high water can submerge the opti completely. Automatic car washes with undercarriage wash can also soak the opti. Secondly, if the water pump suffers bearing failure and coolant comes out the weep hole,... Aug 26, 2013 · What are the symptoms of a bad Ignition Control Module? I have a '94 Pontiac Firebird Formula LT1. Every time I go to drive the car, she stalls at least once. The stall is completely random. When she stalls, I have to let it sit for several minutes before it restarts. (However, one time she fired right back up.) There is no sputter.

What are the symptoms? within the LT1 forums, part of the Vehicle Specific category; I've heard alot about the optispark failing in the LT1's but I have failed to find somewhere on this site ... Digg this Thread! Add Thread to del.icio.us. Dec 31, 2010 · This is a '95 rebuilt (never ran) LT1 with new injectors, opti, coil, wires, sparkplugs, etc. I have tested the injector signals with a noid light, tested the fuel pressure (45psi), tested spark at all plugs- all were good.