Rep Power: 0

Hey all so I recently bought a 2008 Civic with 170k. It seemed to run fine till I noticed sitting at a light in D there is a slight stutter missing action. But when put in Park it idles perfectly. Then driving on the highway I noticed when hitting between 80-90 km/hr it's almost like the engine is misfiring but once past and cruising around 100-110 km/hr it doesn't do it at all. I thought plugs or coil or injectors but to me if this was the case it would be doing it all the time. Any ideas or anyone come across this issue?

Cheers

 
Rep Power: 125

Are you sure it’s specifically 80-90 and not at that certain RPM? You may not notice it as much in lower gears because it’ll upshift pretty quickly. If that’s the case, then it could be something like spark plugs or a bad injector.

 
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So I monitored it when driving to work this morning. I found that it was doesn't even hiccup if you slowly or even quickly accelerate all the way up to 100. However if your slowly accelerating and in that 84km/hr area where it seems worse is if you let off the acceleration then accelerate again it chugs a bit. The RPMs didn't seem to matter as I tried at that rpm area in different gears and it didn't chug at all. Maybe throttle position sensor?

Cheers

 
Rep Power: 125

A check engine light would reflect any issues with the TPS. Do you have any codes?

 
Rep Power: 0

No, I haven't had a check engine light come on. I could still throw the code reader on to see. A guy told me to spray ether around the intake pipe to see if there was any vacuum leaks.

Cheers

 
Rep Power: 0

So driving this thing a bit more it does seem that the little hiccups happen pretty much between 70 and 110 km/hr. This only happens when it is in the last gear 5 I believe when the rpms are sitting around 1800-2200 rpm when I let them off gas and back in again. As long as the car isn't under load it doesn't seem to do it.