Need Advise 348 getting hot and low performance

We would need a whole lot more information to give an educated opinion on this, but first of all, was the car OK before the Winter storage?

Are the oil and coolant levels OK at present? Is there any evidence of oil in the coolant or water in the oil?

Are you SURE that you are not driving the car with the handbrake on? Or jack up the car to make sure the brakes aren't binding?

Have you seen or heard the cooling fans on the two radiators come on when the temperature readings are abnormally high?

Is the engine smoking?

Have you checked the tail pipes to make sure that they are not obviously obstructed (rat's nests??).
Similarly, have you opened up the air filter housing to make sure that rodents haven't nested around the filter or in the intake pipes?

Also, did the battery go dead over the winter? You may need to re-initialize the Motronic ECU's.

 

'Re-seat' all your fuses, relays and engine connectors .