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the 99 Nissan frontier will start and run fine for up to approx. 10 miles. it then begins to run rough and then chokes down. we pulled over and restarted the engine, added some gasoline into the intake through the breather piping, this had no effect on the rough running engine. the exhaust output is pretty strong at this time. when the engine is stopped about 30 minutes it starts and runs fine until again until driven approx.10 miles. the check light works when starting but does not stay on after 10 seconds. do you have any idea what the problem could be.