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Message: <blockquote data-quote="Z28This" data-source="post: 638342" data-attributes="member: 12113"><p>I have a 95 Gt 5 Speed and when the thing is cold or hasn't ran longer than 10 minutes it acts up aprox. 75% of the time. When driving and the accel. is mashed it starts jerking just a littl bit back and forth. You almost think its the road at first but you can feel a power loss. The further you mash it down the worse it gets until it starts popping inside the exhaust pipes. Doesn't crack like a backfire but just a low thud i guess you can call it. I have pulled codes and came up with 172, 173, and 543. Once the car is warm it runs pretty good but still doesn't idle to great. Didn't do this until i put an off road h-pipe on it a couple weeks ago. Car has 173K on the clock I looked up the codes and i was told the 543 is false if the car runs. I have added Motorcraft platinum plugs. Excl. 300+ race wires. MSC cap and rotor. Blaster coil. BBK Cold air intake all withing the past couple weeks (just got the car <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /> Can't really figure this one out unless the O2 sensors went bad as soon as i changed the h pipe. :BangHead:</p></blockquote><p></p>