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P0300 Random Misfire

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99eclipsegst99

Probationary Member
13
0
Jun 11, 2011
Freehold, New Jersey
Hello I checked through I didn't see anything similar to the issue I have been having.

From the begining I am driving my 99 Eclipse GST Spyder (4g63) and all of sudden I hear a pop. When I get home I notice that two of the bolts snapped off the exhaust mainfold on the left passenger side. So i ordered new bolts and replaced them.

After that my car throws a P0300 Random Cynlinder Misfire. It sounds like VW bus, sluggish and now power what so ever on take off.

Changed the plugs, the wires and nothing. I take it to PEP Boys to diagnos and they tell me its my ignition coil and that i need to replace 2 of them for $200 a pop and $80 x 2 in labor for each. Which I found out later by doing research its only one coil pack and I got from the dealer for $100.

I put in the new coil pack in yesterday and still nothing, still throwing that p0300 code. I heard someone say that it might be my catalytic that is clogged and might have popped the bolts of the exhaust from the pressure.

Before I go through of ordering a new one, thought I get a thought or two. Any help greatly appriciated.

-Noob-
 
These big injectors are to run e85 right? Do you have a flex fuel sensor? & the other piece I can't think of currently.

I would drop back down to a hotter plug since e85 burns colder by itself.

No leaking valve covers? No oil on plugs? Gap smaller.
 
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