think my engine has gone or going ? help

hi ive got a 2001 51 jimny with the dohc engine and its never done it before but after my screeching belt fault i thought id change the belts , its chain driven but theres a pas belt and a alternater belt , ive also been ding my kingpin bearings so been off the road for a few days
anyway came to start it and it sounded very strange it wasnt turning ove properly at all , eventually it chuggs up into life after about 30 turns of the engine , i thought it was just choked up , it started fine everytime after that but tonight its done the same again
i once had a laguna with a snapped timing belt and it sounds like that , no compression etc , what can i check with winter coming on i really need it on the road.

Charge the battery make sure there is no dampness around the spark plugs and leads/coils check the plugs may be a service and it could be bad fuel

ill charge battery tonight and try again in the afternoon tomorrow , think fuels ok , had a service a few months ago , no water in oil?
knowing my luck it will be engine goosed? , would a dodgy sensor make it sound funny turning over?

ive got a dohc engine going cheap if you need 1

i might need one m8 , cant believe it rich , its 1 thing after another , what they like for fitting does the ecu need coding for the new eng?

No just fit it and away you go