Power loss stage 2 Roush

[marinepluggers]

I have a 2019 Gt with the Roush stage 2.
Lately I take it out for a cruise all is well full power. Stop to have lunch or ???. When I start the car up it run and idles fine but only achieves half power. Restart same thing. Next morning same thing. What the heck?

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[Redfuzzbutt]

Random guess: your spark plugs probably have been in there for quite a while plus the heat soak of sitting there after driving causes a significant change in your timing/spark.

How long have you had your spark plugs in?

 

[marinepluggers]

To clarify, every day this goes through the same cycle. Power until first stop and then weak the rest of the day. Fresh spark plugs as recommended and as prior. Installed last week.

 

[Cory S]

Is your heat exchanger fluid pump working?

 

[marinepluggers]

Interesting, I will have a my mechanic consider that. Never heard of this being an issue. Thanks

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