p0411 code, engine breaking up at low rpm

jbmiami14

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I have a 96 Cobra, the car is breaking up when first getting into the throttle. Check engine light came on and threw the P0411 code.....secondary intake system incorrect flow. All this started when I put in a JLT ram air intake..the car had more power but the IMRC didn't like it so the car would chug in higher gears...also ended up fouling a plug on cylinder 6. I changed the intake back to the stock which only has the K&N high flow filter, cleaned MAF, IAC and replaced gasket, cleaned throttle body also. When I put in the new plugs it ran great for a mile or two then started to break up when throttling up and the CE light came on with this code...I have checked all hoses and can't find anything that would be leaking...has anyone had this problem when they changed intakes? Can someone please point me in the right direction to fix this....car still runs and has power but its just not quite right. The only mods on the car are 3.73 rear end and exhaust upgrades. Thanks!!!!
 

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