My Bonneville is sorta jumping at idle speeds or coasting if you will.
You can power brake it and touch the gas pedal and it will almost die has a sense of missing if you will.
on a cold start if you leave hard on the throttle the valves are rattling bad ! But once warmed up no longer rattles.
Sometimes on cold starts leaving driveway brakes go to floor board but by the end of the drive have full pedal of brakes.
On cold starts when you gas on it you can hear a whistle under the hood or either air sucking but sounds more like a whistle to me .
Just replaced the mass air flow because it was under warranty.
Service engine light keeps coming on , once it was the temp sensor , now it is coding something about exhaust gas temp to high , which I was told would mean the EGR .
Evidently I am losing Vacuum because of the brake issue , and could possibly be the whistle im hearing .
Now on older cars you had vacuum advanced timing , which would explain the valves rattling but I think the timing on my 03 would be electronic ?
So do I go for a new EGR motor or the EGR Vacuum block or could I possibly have a cracked intake ?
Car idles fine it is not missing at all !
Car is not super charged.