Porsche 955 Cayenne It doesn't take accelerator. It comes intermittently.

[onrgngrr]

3.2 Cayenne exhaust spiral and catalytic converter were made. But after that the car started not accelerating at all. That is, it does not go at all. Even at the first start. Then I was stuck on the road with difficulty and intermittently. It gave a timing fault. On top of that I changed the chain set, crankshaft sensor and two oil valves at the back. When I started the car again there is no fault in the car but the car still has a hard time even taking off, it immediately chokes and stops