starts breaking up at 4500 rpm.

Bobby DiDomenico · 10-20-2015, 11:21 PM

This came with injection correct?
It breaks up with the injection but runs OK with the carb may be that it is running out of fuel. What is the pressure? Had the mass airflow sensor fail on my Buick and it would be ok under light throttle but was lost accelerating under load. It was fine one day and bad the next. At first I thought it was the gas I'd purchased but quickly discovered new fuel wasn't the answer. I'd think fuel first as Ken said. Does it break up even in neutral?
I'm sure the other guys here know way more on this than me and can assist. My niece had a Mustang Cobra but it has been a few years since that was sold.

10-20-2015, 11:21 PM	#3
Bobby DiDomenico Senior Member Join Date: Jun 2002 Posts: 924 Likes: 104 Liked 101 Times in 52 Posts	Re: starts breaking up at 4500 rpm. This came with injection correct? It breaks up with the injection but runs OK with the carb may be that it is running out of fuel. What is the pressure? Had the mass airflow sensor fail on my Buick and it would be ok under light throttle but was lost accelerating under load. It was fine one day and bad the next. At first I thought it was the gas I'd purchased but quickly discovered new fuel wasn't the answer. I'd think fuel first as Ken said. Does it break up even in neutral? I'm sure the other guys here know way more on this than me and can assist. My niece had a Mustang Cobra but it has been a few years since that was sold.