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[neil beard]

i have a problem with my omega engine sometimes the engine is over revving and next it is stalling when the brakes are applied at traffic lights or a round about can any one help

[Grumpy]

Hi, Neil, and welcome to the site.

You need to fill in your profile, underneath your name to the left,
with your car details. (Year, engine size, auto/manual).
Different models have different fixes.

Fill it in, and the folks on here will give you a list of stuff
to check and report back on, that will be applicable to your
model.  

[Danny]

if its an auto, your idle air control valve (ICV or IACV) will need a good flushing out with carb cleaner, this should cure it

have your breathers and throttle body cleaned out too, all helps

[Grumpy]

Hi Neil, I see you've updated your profile to a 2.0L 'W' Reg.

This will probably mean that your breathers are blocked,
and this is oiling up your Idle Air Control Valve (IACV).

To make sure you have no sensor problems, first carry out
a paperclip test iaw the following link. Ensure that your EML
light works before carrying out the test.

http://www.omegaowners.com/forum/YaBB.pl?num=1189022687

On a 'W' reg, I would expect 4 digit codes, not 2 digit.
10 flashes = 0 (Zero).
Post up any codes you get.

Read the following links and clean your breathers, breather jet,
and IACV. The Breather Jet is very important. If it's blocked,
it's pointless cleaning anything else until you've cleared it, or
everything will just oil and block up again in pretty short order.

http://www.omegaowners.com/forum/YaBB.pl?num=1194007453

http://www.omegaowners.com/forum/YaBB.pl?num=1207387811

Post up what you find and ask any questions on anything you're
not sure of.