I have a slight miss/hesitation problem when I put the car to the boards and let it climb in 3rd and 4th gear.....Sometimes it pulls hard till like 4500 then there is a slight hesitation for about 500 rpms then it goes away and continues to climb to 5000+..then there are other times when it does not do it at all. It only happens in 3rd and 4th gear...maybe 5th to though....but never in 1st or 2nd.

So I was thinking its either my coil or one of the plugs is fouled up or something. I just cleaned my maf and I just replaced my intake elbow(it was ripped). Also, I have an MSD coil and Moroso wires with about 20,000 kms on them......

What do you guys think??

 

First, check to your spark plugs wires and make sure none have come off. A few people have already experienced this problem. Then rule out any type of problem with the fuel system (injectors or pump) and air intake (loose clamp or hose). If those are okay, it's most likely your Optispark system. It's the pseudo-distributor of the distributorless LT1 where all the spark plug wires connect into. If water gets in there, it's as good as toast. A hesitation problem due to the Optispark will usually be noticed in certain RPM range. Most commonly, it is in the upper range (3500 - 5000 RPM). But it can certainly develop in the lower or mid ranges as well. You might even get some back-firing. The problem is most common on the 1993 and 1994 LT1s, as in 1995 a vacuum line was added from the intake manifold to the Optispark to draw moisture out of the unit. However, excessive water can cause even 1995 and later cars to develop the problem.

If it usually occurs from idle when then engine is warm and you get a short backfiring just before shifts, then it's probably the coil wire or the coil itself. If you notice the headlights flicker or flash at night when the car stumbles, it's almost assured the coil and/or coil wire need replacement.

 

the opti has been replaced becuase it crapped out on me once all ready...so I dont think its the opti cause the car couldnt even get passed 4000 before...unless now its in early stages of getting shot. The thing is, it only happens sometimes....

would auto tap be able to tell me whats up?

 

the moroso wires also came with the coil wire.....so ya, about 20,000 kms tops

 

ttt

 

Yeah it very well could be the opti. Mine was doing the same thing at wot at about 4500 rpm or so. It was doing that every now and then for about a year and i never fixed it. Then i finally installed my tnt kit. Couldn't wait to try it out on the street. Finally got my chance sprayed the 100 in second gear and never got to third gear. Damn opti blew so hard i thought i blew the intake or something and the car just died. My car was towed 4 times last year I think i need to get AAA