Correct timing is on a chain, but how long have you had this car? If the other owner has been trying to fix the same fault and has had the cam out for what ever reason!!! Then the timing could be out, as if you follow the guide I put up they don't use locking pins and it is very easy to have the timing out, as the cam chain cog is bolted to the cam shaft without any key way if you don't lock engine at TDC together with the fuel pump and cam shaft you are asking for trouble.
It's always best to check timing after having the top end apart, it does not take long to do.
1. Put engine to TDC, mark on crank pulley about 1o'clock
2. Take cover off fuel pump ( six screws front right on engine, you may have to take aux belt tensioner off to get to it)
3. Remove crank sensor (just above sump on N/S of engine)
4. Remove cam cover and and remove vac pump to check cam position correct.
Fuel pump has a locking pin hole at about 1 o'clock when at TDC and all should line up, and if you use a mirror and torch you can check the crank is in correct position as there is a locking pin hole in crank that you can see when sensor removed,