Q: a very bad miss in morning

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Some mornings I start car and idles great. When I take off it shakes very bad and misses. Mechanics have replaced fuel pump, injectors, fuel filter, catalytic converter. When I finally get it to the shop and mechanics crank it to test drive it runs perfect again. Has happened about 6 to 8 times over last few weeks. No lights come on except once, service engine soon and showed the injector problem. They have also changed a couple of sensors. When giving it gas is when it misses during these times. Can't get above 15 MPH during these spells I trust this shop a lot and have used them for years. It is a 1998 Pontiac mini van loaded. Also looking for a dash panel to replace cracked one or a way to restore this one that doesn't look like a hot rod. thanks

My car has 192000 miles.
My car has an automatic transmission.

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