87 k5 350 tbi 700R4 64K orig. miles. My k5 runs smooth most of the time. Ive only had it for 2 months or so now. When I start it up in the morning it acts like it wants to sputter out and die, give it gas it runs fine. On the highway sometimes, very rarely, it will just cut out, engine doesn't shut off just no pedal response or forward momentum, then it kicks back in. Any ideas? I'm thinking maybe fuel filter, I've gone over the tbi unit several times with carb cleaner. Sparkplugs maybe, dispr. cap? Point me in the right direction if you can. Thanks.