Hi i have been having intermittent starting problem on my car for a while. It sometimes starts and stalls then takes ages to start or starts first time now problem. I've found when i've let the engine warm its usually fine. The car is a 07 1.8tdci and it's only started happening after i had my MAF/MAP sensor replaced due to a pipe was loose on it. I purchased a used one would this cause the engine to start and stall/not start?