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Having a slight engine problem first thing in the morning what could it be?

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19 January 2009
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As per above, i'm having a problem with the s15 (s14 blacktop sr20det). Every single day i get in to the car and start it, the car starts and idles completely fine, then as soon as i go to pull out of my drive in gear It feels like an intercooler pipe is off. I can litterally put my foot to the floor and the car struggles to idle and has cut out a few times. This only last for 5 or so seconds and then the car is completely fine.

This only happens first thing in the morning. More predominantly since its been getting colder. The only way this doesn't happen is when i rev the car and pull off in slightly higher rpm's.

I'm thinking it's a bad valve??? not too sure.

Compression tested the engine and i have 9Bar across all 4.

she has just come back form the rollers and everything seems to be fine (she has been doing this well before going on the rollers).

any idea's guys?

thanks
 
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