# 1993 chevy corvette lt1 **URL:** \ **Category:** The Show\ **Tags:** chevrolet, corvette\ **Created:** [April 11, 2015, 6:25pm UTC](https://community.cartalk.com/t/1993-chevy-corvette-lt1/89625 "2015-04-11T18:25:19Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![vette4156](https://avatars.discourse-cdn.com/v4/letter/v/7bcc69/32.png) [@vette4156](https://community.cartalk.com/u/vette4156)\ **Post date:** [April 11, 2015, 6:25pm UTC](https://community.cartalk.com/t/1993-chevy-corvette-lt1/89625/1 "2015-04-11T18:25:19Z")
engine is missing at idle, changed plugs,wires ---
**Author:** ![asemaster](https://avatars.discourse-cdn.com/v4/letter/a/5f9b8f/32.png) [@asemaster](https://community.cartalk.com/u/asemaster)\ **Post date:** [April 11, 2015, 7:47pm UTC](https://community.cartalk.com/t/1993-chevy-corvette-lt1/89625/2 "2015-04-11T19:47:34Z")
I’d replace the distributor cap and rotor too, and check for vacuum leaks. ---
**Author:** ![Cavell](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cavell/32/43396_2.png) [@Cavell](https://community.cartalk.com/u/Cavell)\ **Post date:** [April 11, 2015, 8:06pm UTC](https://community.cartalk.com/t/1993-chevy-corvette-lt1/89625/3 "2015-04-11T20:06:51Z")
Generic cap is $100. GM cap is $400. 8 coils? ---
**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\ **Post date:** [April 11, 2015, 11:48pm UTC](https://community.cartalk.com/t/1993-chevy-corvette-lt1/89625/4 "2015-04-11T23:48:06Z")
Hmm, LT-1 is the victim of an OptiSpark that is anything but Opti! You might want to read this. [http://www.lt1howto.com/articles/optisparkfaq.htm](http://www.lt1howto.com/articles/optisparkfaq.htm) This things are problems, pure and simple. This site can direct you to solutions. Swap for the factory cap and rotor or an MSD unit for about $400 to $500. ---
**Author:** ![asemaster](https://avatars.discourse-cdn.com/v4/letter/a/5f9b8f/32.png) [@asemaster](https://community.cartalk.com/u/asemaster)\ **Post date:** [April 12, 2015, 2:44am UTC](https://community.cartalk.com/t/1993-chevy-corvette-lt1/89625/5 "2015-04-12T02:44:18Z")
Given that the belts, water pump, crankshaft pulley, and a few other items need to be removed to service the cap and rotor, I highly recommend you use only quality factory parts. I’ve seen too many problems with the aftermarket units. ---
**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\ **Post date:** [April 12, 2015, 3:43am UTC](https://community.cartalk.com/t/1993-chevy-corvette-lt1/89625/6 "2015-04-12T03:43:19Z")
The link by @Mustangman is very informative. If I had this problem and was willing to do a little experimenting first before starting on replacing the opti-spark stuff (which might prove expensive), I’d be inclined to see if a simple cleaning and drying out of the gadgets might work. Remove as much of the opti-spark stuff as you can and let it sit in a dry spot outside in the sun for a couple days, meanwhile clean any oils and/or moisture out of the housing where it resides in the engine compartment. For moisture in the housing, I’d also use one of those things that comes in the box w/cameras, that moisture absorbing pellet thing. Heat it in the oven at a low temp for a few minutes first to drive away any moisture it is retaining. Then put it in the enclosure, seal it up, and let it soak up any remaining moisture in there. ---
**Author:** ![ok4450](https://avatars.discourse-cdn.com/v4/letter/o/e9bcb4/32.png) [@ok4450](https://community.cartalk.com/u/ok4450)\ **Post date:** [April 12, 2015, 7:46am UTC](https://community.cartalk.com/t/1993-chevy-corvette-lt1/89625/7 "2015-04-12T07:46:57Z")
A dropping cylinder is also a possibility along with a dozenish other things. It’s a 93 with ? miles on it so compression is certainly something for consideration.