Roberto Capellan

Hello everyone see if anyone has had this issue before. Ok so my Audi is a 2009 A4 Quattro 2.0t with 120k first started acting up at the beggining of January went to start my car only would crank twice but wouldn’t turn on again I will try car would crank twice but not turn on so I let it sit over night but the car wouldn’t turn on next morning I called a tow truck to bring it to mechanics when the tow truck driver went to hit switch to put it on neutral he tried turning it and the car turned on so I was like ok cool a week later same thing happened mechanic diagnosed alternater we changed it car turned on drive it for 2 days same issue happens again so now we changed the battery car turns on but 3 days later again same issue so we changed camshaft sensor/crankshaft Sensor but nothing so open up timing chain to find out that it was no good replaced timing chain so now car turns on but makes a weird knocking sound near fuel pump I brought car to dealer they checked it all out and came back saying it could be the Computer of the car or the fuel pump to start with the computer first and if that doesn’t work change the fuel pump, car is driveable I put it on the highway and it drives fine also in the city but can’t rev past 4000rpms and has loud knocking noise near fuel pump? Anyone have any input on this PLEASE HELP