My Honda only runs rough when it's warm outside, like over 70 F and only when I first start it accelerate it in gear. Recently it threw a couple misfire codes and I changed the spark plugs which helped but I feel like they fouled quicker than they should have since I changed them about 1 year prior. I've also changed the fuel filter/ pump and an oxygen sensor. I was just wondering what could cause this weird problem. Thanks.

 

incorrect engine coolant temp or intake air temp reading will do this too. check the readings with and OBDII scanner

 

What are your codes?

Check the EGR valve for failure and clogged ports with carbon.

 

I just got a code yesterday and it was a cylinder 1 misfire. I pulled out the ignition coil to switch it with cylinder 4 to see if the ignition coil was the problem and there was a little bit of oil on the outside of the coil. I'll check out the EGR valve when I get a chance.

 

Use only OEM NGK spark plugs.

 

I only use NGK spark plugs, I cleaned the EGR and the MAP sensor but to no avail. I can't figure it out.

 

oil on coil would say the valve cover gasket...the 4 o rings going around the plugs...are leaking. This could foul plugs...