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Discussion Starter #1
Hey guys, i had a quick question. Right when i start my car and it has been sitting a few hours, it runs shakey and hesitates when i step on the gas.... It has been doing this since I installed my Rc 550's.. I replaced the lower seals and everything is nice and snug. What can be causing this? Thanks!
 

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Whats your base fuel pressure ?
 

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Discussion Starter #6
I have a afc.. I leaned it out about 10%... It only does this when the car is cold.... It will be idling at about 950 and slowy drop to 750, but till it does its shakey and hesitates... I don't know my fuel line pressure. I need to get a guage. I have a vr-4 fuel pump.
 

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What about your o2 sensors readings?

MY friend has this problem and his o2's are reading high .2's

I think maybe his o2's are bad.

He had rc 550's and wallbo 255 pump.
 

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Discussion Starter #9
I doubt its my o2 sensor.. its was replaced about 10,000 miles ago. I tuned my low 1000 rpm settin by lowering the % till the o2 stayed at .2 then raised it 10% (Road Race's instructions) so i don't think tuning is really the problem...

Should i gap my sparkplugs and different with 550s?... Man this is annoying...
 
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