My issue is i recently did a tune up on my 88. It has a powerdyne supercharger and has its own belt and manual tensioner on it. The car has been sitting for almost 2 years. I drove it yesterday to a city about 75 minutes away. Midway through the drive i went to pass someone and i had no boost. Then later i went to pass someone and the boost was going in and out. Once i came to a stop and started again it was boosting fine. I was told could be a fuel issue. Please help!!!!