Shutter during low acceleration after warm

are you losing any coolant?

 

How recently did you do the cleaning? And how did things look, the Exhaust Gas Recirculation passages in the intake for example?

 

Leak down test would determine if it’s head gasket.

 

Can’t really answer. In your shoes I’d minimize use of the car and get leak down test soon. If there’s enough of a coolant leak (through head gasket into cylinder) there’s a risk of hydro lock: piston tries to come up, can’t compress the liquid, bends or breaks.

 

I am about to do my EGR too. Can you tell me more about the brush kit that you mentioned?

 

What I found to work well, for the small Exhaust Gas Recirculation passages on the intake manifold, was a nylon bristle brush designed for cleaning stainless steel drinking straws. Start it in, add a squirt of brake or carb cleaner, work it.

I also picked up a variety pack of similar brushes at an automotive supply place, think they were described for cleaning AC lines or something.

A grabber tool with a scrap of rag in the jaws is good too.

 

Hopefully your head gaskets ok then, and the Exhaust Gas Recirculation (plus intake manifold) cleaning will help.

Is the shudder gone?

 

If current intake is fully cleaned I don’t think that would help.