h.o.ls1

iTrader: (2)

well i have a 98 camaro with the ms4 cam and some bolt ons..any way it just started like loading up everytime i go to get on it just a lil bit it cuts out then will go then will cut fuel it feels like and backfire then die then ill restart it and its good to go and will do it right away again? ive already checked the maf. its got fuel pressure and i swapped injectors but its still doing it....WTF!!!!!!

any help would be great!

QuickdomesticRacer

iTrader: (4)

I'm also having similar problems. But mine doesn't stall, just runs very poor. ttt

VH5150

Its probably the tune

h.o.ls1

iTrader: (2)

its been fine for the last year..what would make it turn all the sudden?

BenLaz

iTrader: (6)

check the wiring running to the crank position sensor... it might be burning/shorting out against your headers

h.o.ls1

iTrader: (2)

ok ill do that

QuickdomesticRacer

iTrader: (4)

Thanks for that as well. I'll try that.

h.o.ls1

iTrader: (2)

nope no burning wires

BenLaz

iTrader: (6)

hmmm your problem sounded exactly like how my car was acting.. and it turned out the wires going to my crank position sensor were burned thru from resting on the header primary... probably causing the timing to get all effed up! which would explain the loading up and back firing..

QuickdomesticRacer

iTrader: (4)

Damn. Alot of checking.

I read somewhere it could also be faulty injectors, bad coils, o2 sensor, MAF, TPS, broke valve and/or valve spring?

h.o.ls1

iTrader: (2)

well im assuming its a broke spring since everything else has been changed ...i just dont see how i could have broke a dual spring running with the cam that i have...

QuickdomesticRacer

iTrader: (4)

I had a major vacuum leak. fixed that. Ran fine for about 20 miles, then symptoms came back. GM's tech2 said Vacuum leaks, and possibly O2 Sensors..

Oso SS

iTrader: (3)

kind of obvious but have you checked your spark plugs and wires?

Old Geezer

iTrader: (3)

Scanned it?

lemons12

iTrader: (71)

i also have an ms4.. and see this problem a lot.. i have the same problem but mine just loads up between 2k-3k rpms and stops EXACTLY at 3k rpms.. will do it for about 5 mins when it gets warm.. then will stop.. turn it off and turn it back on it will do it again...

also, i normally idle around 1500 rpms.. its supposed to be at 1000rpms no matter what... thats what the tune is for at least.. everyonce in a while it will go to 1000 but thats rarely.. if i put it in park it revs up to about 2k rpms then goes back down to about 1300..

Old Geezer

iTrader: (3)

Well, have you?
Looks as tho you have checked some items, replaced the injs, and there's still no scan done??

linegtdt52

iTrader: (12)

You really opened pandora's box but you need a scanner to tell you first if you are throwing anything. Second you need one to log your tables so you can see map response and tps resonse. I havent seen it but maybe your TPS sensor is running out of range because it's shot. You map sensor could be shot as well but if it was shot it wouldn't idle below 2000. GET THE SCANNER

linegtdt52

iTrader: (12)

Still also sounds like O2 sensor, good luck