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Thanks for the idea, I plan on checking the compression today, I did check every hose for a vacuum leak using a carburetor spray cleaner, no hissing or idle speed chang noticed with the cleaner, I'll try a gauge. Thanks Dick

Hi, I did have PT plugs in there when the problem started so I called the jeep dealer and they told me the standard plug for my 4 liter motor is a Mopar copper core not PT, that's why I changed them to Auto lights copper but it didn't solve the issue. both types have experience a rough idle...

Hi, the Code was P0305, the code indicated cylinder 5 is the problem so I added some Sea Foam to the gas tank to see if it would clean the injector in cylinder 5 so far it's still running rough so I plan on changing the injector in just cylinder 5. What's your thought of changing the MAP...

No, it runs rough in park/neutral/drive. While driving it runs smooth with power. Today check engine light came on, autozone says it is cylinder 5, ignition problem. I have already changed plugs, wires, distributor cap and rotor with no change in the idle. I added seafoam as suggested by...

1998 Cherokee Classic 4L perfect shape came from the south, just recently the engine is running rough in D/ R, I've done all the typical things: New Copper plugs, distributor cap, rotor, plug wires, Cleaned Throttle body Replaced IACV sensor and TPS sensor. Disconnected the battery for 1...