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Hi there mate , The problem will still lie with your new EGR valve as this needs to be programmed after instalation with Fords IDS computer , This will probably cost about half an hours labour at a ford dealer ,
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Hi and welcome to JA.com,
what you may need to do is have a 'live data' diagnostic done, basically the car will be hooked up to a diagnostic machine and taken out on the road to replicate the fault and monitor what the vehicles various sensors are doing, it will let the technician know what the boost readings are and what the fuel pressure is and even what the EGR is doing when the problem occurs,
chances are it will be down to a dodgy sensor, but only the diag test will point out where, split boost pipes will cause loss of power but it would tend to occur more than just when going uphill, plus you do tend to get an induction noise when accelerating, check the boost pipes for splits and tears/rubbed through etc, check they are fitted securely too, if all sensors are ok and there are no holes in any pipes, low boost pressure could be a sign the turbo actuation is faulty or the turbo itself is on its way out, low fuel pressure can be a common issue caused by anything from dodgy fuel to a failed fuel pump, check the filter, change it if unsure of its history or if the miles are high, check the bottom of the filter housing for signs of metal swarf, this is a sign the fuel pump could be breaking up, and it can be expensive to repair, plus the swarf can get into the injectors which will kill them too, The EGR system if faulty or blocked, can cause a low boost pressure situation that mimics a turbo problem, be careful not to condemn the turbo and find out after the EGR system is blocked,