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Just want to give an update. I have added half bottle of Bar's Leaks HG-1 to the cooling system today, followed the instruction to idle for 15 mins, cooled down for half hour, and then drove gently for 15 miles. Shake gone just like magic! I can feel the engine power even after 15 miles driving...

It is just 90K miles... I am thinking if I should try some head gasket sealer before spending money on replacing engine. I searched on the web and seem Bar's Leak can do the job. Any thoughts?

Did a compression test and found there were no compression in cylinder 2 & 3. Mechanic quoted $3000 for replacing a 2nd hand engine....He said changing the head gasket may not fix the issue....

Yes I checked all 3 mounts and they looked good. Last night I drove uphill, it was around 30 mins driving with Gear 2. After I parked my car I found the temperature was close to red line and I could hear boiling sound from the coolant reservoir. I opened the hood and found the reservoir was...

Thanks for reply. I checked the mounts and they are still good. I am wondering if there is ignition problem as the engine just keep shaking with rhythm when RPM < 1000 and shake gone during acceleration. Don't know why there is no code coming out.

Hello, I own a 2006 Mazda5 2.0 and the problem came since last week. The engine shock slightly during idle when A/C was off, and shock like going to stall when the A/C was on. When I pressed on the pedal the vibration simply gone. It ran smooth like usual but gas consumption increased by 1/4...