Q: It will shudder and sometimes die on the highway

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It starts fine and for the most part runs fine. But I can be driving down the hwy and it will shudder and sometimes just die as I'm driving. And the tach will jump all over the place. Sometimes it just comes back on, other times I have to pull over and start it. The ignition system has recently been replaced. The fuel pump and filters have been replaced. A coworker mentioned something about the intake manifold might have a leak. I'm at my wits end and could use some guidance. You know, other that a 50 cal. Through the block. All the work I mention has been done by a certified mechanic and he is at a loss for what's going on. Thank you for your time.

My car has 158000 miles.
My car has an automatic transmission.

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