Google will show you pictures of what to look for but I would suggest trying terraclean. They offer a specific clean for the egr without removing it and can check the system operates correctly so it won't simply clog up again during to a fault in the system.
SOURCE: jaguar x300 central locking problem
If the locks are working whilst you are driving then more and likely it is the actual door lock assy that is bad. the solenoid go bad and can cause erratic operation. But unfortunately they are only available with the whole door lock/latch assy.
I would disconnect the drivers and see if the problem still exists.
JPTCAT
SOURCE: where is the egr valve located on a 1999 silverado 5.3 vortec
try cleaning the inside of the MAF sensor with CRC brand MAF cleaner, it is availiable at any auto parts store for around $5
SOURCE: egr valve location
The EGR Valve Location is typically housed on the intake manifold this schematic may help you
http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c1528008822d
SOURCE: pcv valve location on jaguar
This is just a suggestion, but, many newer vehicles don not utilize a pcv valve anymore.
SOURCE: egr valve location on dodge ram 2005 4.7
The EGR, or exhaust gas recirculation valve, takes inert exhaust gasses
drawn from the exhaust system and reintroduces them into the combustion
chamber through the intake manifold. This process lowers the peak
combustion temperature and helps combat the formation of Nitrous Oxide
(NOx) in the exhaust.
I hope help you with this. Good luck.
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