i have changed the 3.0l engine on my camry and for some reason the gas wont work properly it runs fine on petrol but on gas it idles very lumpy about
You might want to clarify what the heck the difference is between petrol and gas. If is runs fine on "petrol" then put that in your gas tank.
I believe (best guess) that the OP means to say gasoline (petrol) or LPG (propane) or some other pressurized gas.
I suggest you take it to a mechanixc knowlegable about the system and let him diagnose the problem.
"Autogas" (or "gas") in Britain is what Americans call propane.
"Petrol" is gasoline.
Petrol is about twice the price of autogas due to British tax policy. This has given rise to a conversion industry devoted to switching petrol vehicles to use gas as well as petrol.
Apparently driveability problems are common with these conversions. No, I don't know why.
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