Is this a 2.4? I had one that the balance shaft belt broke and made the timing belt jump. Had the same symptoms as you. Vibration comes from the unbalanced oil pump shaft, sputtering could come from the timing being off.
May be the micro filter in the high pressure fuel pump. This pump is located in the engine bay. The vehicle also has a low pressure pump in the tank. If the high pressure pump is not delivering fuel to the fuel rail effectively in the GDI versions, the car will die under load. Its not a big job to do usually its a kit replacement with o rings and a micro filter. Probably a job for the serviceman.
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possibly camshaft position sensor in the distributor, or weak fuel fump starts acting up when warm, or throttle position sensor. heat has a effect on sensors and electrical components in some weird and hard to find ways.
Sounds like one of the coil over plugs have gone bad. this will cause mis-fire which causes your car to sputter, skip, and shake. It can be changed easily when finding out which one it is. But rather expensive for a simple part $40+ each.
It sounds like you may have a problem feeding the fuel to your engine, I had the same problem with my 89 RS. All the 1989 model's fuel systems were recalled. I think you may need a new fuel pump. The fuel pump is located inside the gas tank in the rear of the car right under the rear axle. The fuel pump itself isn't too expensive, but with other small parts such as the electrical harness upgrade and fuel filter and the labor you should be looking somewhere in the $500 range. I hope this helps.