I have a '97 Viper with about 22K miles. On the highway the other day I experienced hesitation as if I had suddenly rested my foot on the brake. I was maintaining constant throttle with no shifting; just cruising along. About a mile later, I was suddenly back up to speed. The coils appear to be okay according to one mechanic. So, I thought I'd check with you experts. It's only done this one time since. Oh, and it was a rather hot day here in the desert in Las Vegas. A weak fuel pump appears too obvious, but maybe...or bad gas...or, I'll just stop here and defer to you experts.