ok i just had my car completely rebuilt, didnt have any $$ left for a dyno tune yet so im running off the previous tune which wasdone by pcmforless , main things that were changed - went from a 350 to a 355, lower compression, 9.5.1 , added 1.6 roller rockers. elect water pump and deleted a/c and long tube headers. car was already tuned for the cam, ported heads and shorty headers,along with the vortech blower. problem is after the build it doesnt wanna seem to run more then 15-20 mins then it starts idling funny and wants to stall, if you let it sit for 20-30mins your good to go for another 15mins or so. wandering if it just needs to be tuned or possibly the MAF is crapping out, its a granetelli btw, everything else is new tho besides that. any help would be great!!

 

You need to scan and see what is going on.

 

Should throw a code if its the MAF sensor. For instance mine is throwing code 048, cleaned it put it back on and still same code.

 

Did you ever figure out the problem?
Mine's doing same thing.