1999mustang2000

in park i can rev it and it has heisitation like wen i rev it it takes a sec to rev or open the throttle...it runs pretty rich still ive check alot of things and i cant find a vaccum leak ne where....wats wrong?

blackstallion666

r u still runing converters? sounds like there possibly clogged. What have you checked so far?

1999mustang2000

yea its still got 2 its got an slp catted x-pipe
i havent really checked nething besides the vaccum lines and connections

blackstallion666

does it feel like its missing or just breaking up when you rev it. And is it sluggish when you rev it?

1999mustang2000

not really sluggish and to me it feels like its missin and i got my dad to look at it and he says it aint missin but if i rev it and hold it and let of ad rev again b4 the rpms fall it feels like it misses or cuts out

1999mustang2000

ne other opinions?

jwarner0297

PCM problem?

1999mustang2000

i pray not ^

blackstallion666

Try unpluging your maf and see how it runs. If its dirty or damaged it could cause your concern. By unpluging it the pcm will use the tp and rpm to guess air flow. Now if that doesn't solve anything. Try unbolting the h pipe at the exhuast manifolds. This is gonna check and see if the cats are clogged. And another thing to check is fuel pressure and see if its dropping off when it starts to run bad.Also i forgot to ask is your CEL on?

1999mustang2000

ight ill try that tommorrow and i dont know wat the cel is...do u turn it on and off with a tuner? im guessin its on