Ouch, sorry to hear about your issues.

Is that a diesel engine? They are sometimes designed so that rockers break apart if the cambelt snaps. This prevents pistons and valves from being damaged.

Does it only shake at 60-ish mph? If so, you probably need to have the wheels balanced.

Does it squeak all the time? Or when going over bumps? Or when turning the steering wheel?

Is it the same crankshaft as the old one? Same part no?

Hi.

Start with the basics – replace the engine oil and oil filter.

Check the air filter and replace it if it looks dirty.

Then, new spark plugs – this isn’t an expensive or complex job.

Do you have any warning lights, do you see any leaks underneath, strange noises?

A water pump is not a wear-tear item that needs to be replaced on a regular basis. And yes, it can go past 100,000 miles easily.

If the running temperature is OK, especially when driving on the highway, then you shouldn’t worry. I’d suggest doing a coolant flush, however.

Hi.

Your engine might be running rich, with unburnt fuel going into the cat, where it causes it to become hot.

Have you ever noticed a flashing check engine light on the dashboard?

Hello.

Which car do you have?