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  1. LT1 | LT4 | L99 Engine Tech
    Hey guys I have a 95 Firebird and have been chasing an issue with half to full throttle hesitation and loss of power. It mainly occurs from 1000-3000 rpm when accelerating with about 40% or more throttle. I have checked the fuel pressure, ran codes, replaced the optispark twice, and replaced the...
  2. LT1 | LT4 | L99 Engine Tech
    I’ve had it, today at crew car wash my $500 MSD Optispark went out for the third time in the last year and a half. Error code for low and high res showed up. I’m not doing this anymore , what alternatives are there to Optispark that actually work other than the method of using the optical sensor...
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