BMW Repair: bmw, fuel pressure regulator, bmw model

Question
model 316i year 2000 vin number wbaan72010nc64598 hello don i sent u a email 2 weeks ago about how my car when first started seems under powerd jumping when driven but when it reaches top tempaurture it runs fine changed spark plugs bmw parts air filter and you said try fuel filter well done that also but still doing the same thing also when you have driven for a while running fine if you stop and engine cools for a bit when started again same thing happens but not for as long  

Answer
Well you have a good start on the repair.You need now to measure the fuel pressure to see what it is when running.Should be about what is listed on your fuel pressure regulator(about 3.0 bar,I would guess)But it is written on the valve.check that and let me know.