Hi ya all need advice here. Well don't we all. Anyways i had a cracked Thermostat Housing so i replaced it with the Aftermarket full Metal Housing. Pain to get on but here is my Issue now. After peplacing and adding a new Thermostat i was able to get it back togethere (Thanks to Snap On Tools and the 8MM Crow Foot tool) Refilled the Fluids and started the Engine. Then my Check Engine Light came up and Restricted Performance with Amber Light. When driving the car accelerates Slow and also cuts out when hitting the Pedal hard. Any Ideas what went wrong? Oh yes it is a 2001 XJ8. Thank you for any help in advance