To get any EFI system to work properly, you need proper tune. You can spend thousands on the very best hardware and software, but if it's not tuned correctly, you're sunk. And it really doesn't take any real specialized knowledge to do that. All the software packages available are pretty much the same in operation.
My EFI is from Haltech. It's an OK system for it's time. I struggled with it for about 2 years. It was never right. I was afraid to leave the house without the laptop, as something was always a little off. I was constantly tuning it.
Then I found a local dyno shop that knew what they were doing. In about 3 hours, they had the whole thing tuned perfectly. When they were done with it, I never had to connect the laptop again. It ran perfect in all situations, and is a real joy to drive.
An 8 stack system has it's own issues that have to be addressed before adjusting the computer. The key there is the proper balance. All throttle bodies have to be adjusted so the air flow is
Exactly the same. This is crucial. If you skip this step, it will never run right.
If the linkage isn't working right, no amount of dyno tuning will fix that. It's a tedious process, but very important. You have to watch the linkage across the rpm range, and make sure there's no binding or drag. I spent a lot of time making the parts I needed to get my linkage just right. It took me about a week in my spare time until I was happy.
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Originally Posted by twobjshelbys
As I said, the root of all my problems is a bad installation from the get go - before I got the car, and probably the reason it was sold. The biggest problem I have is that there is noone around here that will touch the Accel system (independent of the 8-stack).
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I would recommend two shops that have dynos, and know what they're doing: Lou's Cars, in Littleton, and Revolutions Performance in Colorado Springs. Both shops are real pros and know what they're doing. Lou is "retired" now, and only works on fun projects.