doughboy4.6

Ok I had my car dyno tuned today on a mustang dyno it put down 285rwhp and 299.9 rwtq na then we did a few n2o pulls and the last one I had a backfire (sounds like a shotgun) and I did do break anything but now at low rpms it feels like a slight miss ant like 1500-2grand any info will help I was thinking plugs but I dono never had this happen before

96cobra10101

Guys at the dyno could not tell you? Maybe you fouled a plug (hopefully). Was he programming you? Your A/f may be off.

doughboy4.6

ya the na tune is pefect.We stoped tuning the car after the backfire I had a hour drive home did not notice it untin I got back in town ya I hope it is a bad plug if not what will it be?

JD1969

Possible small crack (or cracks) in the intake manifold, melted plugs, bad sensor.

doughboy4.6

no copper plugs one stage colder then stock.So if it is not plugs change the intake?

doughboy4.6

If it was a sensor I think I will have check engine light on

doughboy4.6

tt