SOURCE: 2006 scion TC Hard starting
Does it start if you give it gas when turning the key? I had a grand prix that would not want to start unless I gave it gas. It was an easy fix. I changed the air filter, used MAF cleaner to clean the MAF and I also took the throttle body apart and cleaned that. The throttle body had a black build up in it that I cleaned up with throttle body cleaner.
SOURCE: engine bk firering & lose of compression.
Backfiring after warming up can be from many things.
One that comes to mind is carbon deposits on valves, causing them to not close properly. The carbon deposits would also heat up and then ignite air/fuel mixtures before the spark plug can fire.
Or you would have hot exhaust gasses leaking back into the cylinder on intake and that would ignite the fuel.
Tac gauge fluctuating, and engine running rough on acceleration could be a vacuum leak, do you hear a hissing sound when the engine is running? listen closely under the hood. If you have a vacuum leak you would lose power and your RPM would fluctuate oddly. As for the backfire however, there are probably more than just one problem. Its hard to say for sure.
So please, more details, noises you hear, when exactly everything happens etc.
What speed and RPM the engine begins to bog down at, does it stall? What range is ur tac fluctuating at? anything you can think of, throw it on there.
Hope this helps you
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