Will not start

The check engine light was on. A few times it would not start at all unless I opened the hood and then closed it and then tried again to start.

Put in Seafoam and it ran for a short time and then lost power while driving. Although it lost power, the vehicle went into a short period of cranking, meaning it sounded like I was turning the key even though I was not turning the key. Would not start again after this last time I drove it and had to have it towed.

Now it cranks and will briefly start sporadically but quickly shuts off.

Things I have done so far:

Changed battery in key/remote.

Changed starting battery with new one.

Cleaned battery terminal connections.

Cleaned electrical connections with electrical cleaner.

Checked fuses- none were blown.

Switched relays for ECM with similar one in fuse box under the hood.

Cleaned throttle body.

Drained fuel tank.

Replaced fuel pump in the tank.

Replaced fuel filter.

Checked codes with Matco Scan tool- no codes showing.

Sprayed starting fluid in hose from throttle body and it will start for about three seconds but runs very rough.

Previously, both of the camshaft sensors were replaced by the dealer about 5,000 miles ago.

Timing belt was changed about 15,000 miles ago.

When I checked the live data with the Matco Scan tool, rpm's were shown and changed when cranking.

It started a few times today but when it did I pumped the gas pedal to try to keep it running and that did nothing.

Not sure what to try next.

Thank you for any help with this issue.