Weird thing just happened, is it a problem?

[no_1_dave]

I have a 1.7 DTI Astra MK4 51 plate.
I was driving home down the dual carriage way when there was suddenly a loss of umph & my engine management light came on. The car drove fine still just with slightly reduced acceleration but then after I had turned the engine off I tried starting it again but it wouldnt start. The starter motor was going, but the engine just wasnt firing up.

I came inside for 20 mins then went back out & tried again & all is perfect. Car starts right away, no management light etc... Any idea what happened? Do you think it'll happen again & leave me stranded waiting for AA? I've done the normal things like check water/oil & stare blankly at the engine! Cant think of what else to do/check..?

 

[no_1_dave]

It is the Isuzu engine

 

[no_1_dave]

my vans doing the same thing 1.7 tdi astravan only does it when i hit 80ish mph and more often than not going up hill i've been told it could be something to do with the egr valve?

Yep, dual carriage way is slightly up hill & I was going about 80.
What does the EGR valve do?

Edit: Ok, using google i've found what it does & it seems to be that.
Also found out how to clean it, just waiting to pluck up the courage to do it myself