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2018 Mustang GT slow startup after driving

Mad

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Joined
Feb 14, 2022
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8
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Location
Texas
First Name
Max
Vehicle(s)
2018 Mustang GT 10 speed
1st start in mornings usually perfect. After driving and then starting vehicle get a very weird start rpms rise to like 500 then 1000 then 1500 and then idles like it normally should in normal range. The whole slow start sequence doesn’t late but maybe 1-2 seconds. Just a rough startup.
Modifications Roush cold air intake, muffler and resonator delete, E85 tune.
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17MagMetal

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Joined
Jan 9, 2022
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Location
San Francisco
First Name
Michael
Vehicle(s)
17 Mustang GT, 07 Ford Taurus SE, 95 F250 Xlt
Seafoam!

No I’m jk - i had this issue when my IMRC broke lol.
 
 








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