Misfire??

[93mkviii]

Yesterday morning I drove the car fine to school. When I got back it started up fine. I take off and feel a rumble, now concerned, I open the window and hear air puffs(No smoke). I pull over and check under the car but during idle there is no weird pops just normal smooth idle.However, that's in park when I put it in drive it rumbles not all the time. At 5-20 miles it feels fine then begins to rumble again and sometimes it rumbles all the time very wierd. I come home and hear the puff sound are coming from under the engine but the engine doesn't vibrate or move just puffs coming either from the exhaust manifolds or cats. I will try to record the sound coming.

Sorry for the long story but in the end my question, is this a misfire or something else. Now the rumble is really unconsistant, sometimes during idle and accelerating. I did just get really cold, maybe a major decrease in temp. influenced the problem but I doubt that.
Thanks in advance and again sorry for the long read.

 

[brentalan]

if there are puffs of air coming out in front of the cats/behind the exhaust manifold I would suspect an exhaust leak.

 

[93mkviii]

Would an exhaust leak cause the car to stumble? The car sounds like it's throwing puffs of air around that area. If it is an exhaust leak how can I fix it.
UPDATE: There is no check engine light(can't even check codes by autoadvance) and it only seems to stumble/rumble at past 1800RPM but sometimes at take off also. I think there is a power decrease also but not much if at all(maybe the cabin vibrating that hard makes it seem like it is trying harder?).

 

[XLRVIII]

EGR tube busted is what it sounds like.

would it cause a stumble, maybe.. maybe not.

There is no law that says "everything wrong is the same issue".

The air puffs may or may not be related to the stumble.


As far as "pulling codes".
The EEC IV mark 8's didn't set codes in the same manner as the later years.
the only CEL's I got out my Mark 8 were EGR and 02 sensor and MAF.
Never ever got a misfire code, because eec iv doesnt care to inform you if it's misfiring.

A plugged or stopped cat, or exhaust leak with make your car do stupid stuff, so if you have an exhaust leak you probably should get it looked at.

The "how do I fix an exhaust leak" question did kinda make me chuckle

 

[XLRVIII]

Yesterday morning I drove the car fine to school. When I got back it started up fine. I take off and feel a rumble, now concerned, I open the window and hear air puffs.

Sounds like to me that you have fallen for the old, "stick a bananna in the tailpipe" trick..

or worse..who know what some people might stick into your exhaust pipes these days, anything from socks to gerbils to much worse based on google images searches. (LMAO)

Go look if the black stuff around your exhaust tips looks to have been disturbed... if so.. be very disturbed.

 

[93mkviii]

My question for the "how to fix exhaust leak" was aimed more towards how do I go about it... can I fix it myself or take it to a mech. etc? (However I wasn't thinking at the time, I'll just search it) So first step get it checked by a mechanic? Oh and I forgot... I had the car align and it started happening 30 miles afterwards.(Don't know if it is relevant but just thought I'd throw it out there.)

@XLR Damn you might be right... checked the exhaust tip and some sticky/greasy substance was around it, how can I fix this disturbance to my tip? Sexual assault to my car(IT'S NOT THE MISTRESS)? Will this fix my problem?...lol.