Ok so I change out IAC sensor and 2 o2 sensor and the cat when o changes my cat out. Also full tune up coils and spark plugs and at 4.4 and still my Honda Accord EX V6vtec runs like poo... Anyways it starts just fine and idle extremely ruff for a while but when it turns up it's ok but has its moments but as so as I trottle it up is sounds good, I let off the gas and goes way slow and almost dies completely and then goes back up to 1000 to 9000 and ruff. Idk new plugs again the are all black? Its alot going on. Can anyone help me?

 

What's the year and model. Is the CEL on? If so what are the codes. Did you change all those parts to fix the problem or it was for your regular maintenance plan.

 

Its 2001 Honda Accord EX I believe V6VTEC yes small upgrading and small maintenancing. Thought it would be easy to fix but not the case. Still runs rich and wants to die but then tryst to run smooth. Also yes CEL is on. No clue what they are. And all the plugs are black know. Where should I start

 

Get the codes read and post them.

 

 

What brand O2 sensor did you use

 

I've only been buying denso parts all OEM u feel me and reliable plus amzon has them and are way faster to get also far less in prices in my opinion. Only thing that wasnt was my JDM duel mufflers.