CEL = Misfire on all 6 and P1489

[Flexcj5]

Had my timing belt done, 3 coil packs and all spark plugs replaced two weeks ago. Started noticing an intermittent misfire shortly after. Friday, CEL is on and misfire is no longer intermittent. Pulled the codes and I've got misfires on all 6 cylinders and brake vacuum syst mechanical malfunction code.

I've traced my vacuum lines to the brake booster and all of them appear to be fine.

I'm assuming these misfires are vacuum related but could my guy have screwed up the timing belt or it jumped time causing the issues?

Any ideas? I don't like driving it like this but I've got no choice right now.

[Peterjk4]

I would start with the spark plugs and see what kind/type they are and what condition they are? Where did you take your vehicle to get the timing belt done? Decent shop? Did he have the proper tools for the job?

[Flexcj5]

I would start with the spark plugs and see what kind/type they are and what condition they are? Where did you take your vehicle to get the timing belt done? Decent shop? Did he have the proper tools for the job?

I know and trust the shop where I took it but anybody can make a mistake. Plugs are Bosch platinum, brand new. I'm taking it back to the shop tomorrow but I want some ideas of what might be causing these symptoms.

[old guy]

Are you sure about that code? I have never heard of a P1489. There is a code P1479 for the vacuum booster pump if you have an automatic.

[Flexcj5]

Are you sure about that code? I have never heard of a P1489. There is a code P1479 for the vacuum booster pump if you have an automatic.

I'm pretty sure that was the code but it corresponded to this "brake vacuum system mechanical malfunction"