So I was red lineing my 04 today and as soon as I got it up to 7000 rpms it dropped to like 6000 and my car slowed down by like 10 mph it never did this before... Is this a early sign of apex seals gone bad or something else?

 

Someone plz help

 

It could be loss of compression, but it could also be a variety of other issues. Tell us more detail about your car:
Maintenance history
Auto/ Manual
Any mods

 

its a automatic with 135000 on it just did spark plugs oil change dont know much about got it used used seafoam the other day

 

Plugs/ coils / wires should all be changed at the same time. Also, do you have the tools to take down your cat converter to inspect it? It's more than likely clogged, due to poor ignition.

Read the new owners stickies, as well as this one to learn about the importance of intake/ exhaust health.

 

Im doing coils this week how do i inspect my cat?

 

Generating Power at Full Throttle
• Ignition Coils
• Spark Plugs
• Spark Plug Wires
• Engine Compression
• E-Shaft Sensor (ESS)
• Air Filter
• Intake Valving
• Throttle Body
• Mass Air Flow Sensor (MAF)
• Fuel Pump
• Fuel Injectors
• Catalytic Converter (Cat)

Keeping the Engine at a Cruise
• Ignition Coils
• Spark Plugs
• Spark Plug Wires
• Engine Compression
• E-Shaft Sensor (ESS)
• Intake Valving
• Throttle Body
• Mass Air Flow Sensor (MAF)
• Fuel Pump
• Fuel Injectors
• Front O2 sensor
• Catalytic Converter (Cat)

Keeping the Engine at an Idle
• Ignition Coils
• Spark Plugs
• Spark Plug Wires
• Engine Compression
• E-Shaft Sensor (ESS)
• Mass Air Flow Sensor (MAF)
• Front O2 sensor
• Catalytic Converter (Cat)
• Intake Vaccum