I just got around to straightening out the new combination in my 87 Limited, and I must say I'm quite confused. For some reason the car feels like it has a misfiring cylinder and is running lean, all the way throughout the powerband. The injectors are suposedly MSD 50s, but there is 45.2 - 45.3 etched in each injector. I'm assuming this means they're flowing about 45lbs, but I also know that PTE flows these injectors at 85% duty cycle. Can anyone else chime in as to what's etched on their MSD 50s? Ive used many sets of MSD 50s before and have never had a lean problem like im having, even at idle. I can crank the hell out of the fuel pressure just to see if it idles better, and it still feels like it has a miss. Fuel pressure is consistent with boost. I have also tried numerous Jay Carter, Turbo Tweak, and Caspers 50# chips with no avail. The car is also slow to spool up, sputters a little under full throttle (even part throttle sometimes) and others it will clean up and pull like a maniac. I thought this may have been an ignition problem intitally, so I put in a new delco 02, and known good GM MAF, CR42TS plugs, MSD wires, GM coil/module, and reset the cam sensor. All GM stuff, not reman or aftermarket crap. The car has a walbro 340 pump (hotwired) PT51, champ irons and intake, 210/210 billet roller, the 50s, a front mount, 3" THDP, single shot, bla bla bla. Also, interestingly enough, i had a old jay carter 009 chip laying around and i threw that in the ECM and took it for a drive. It idled WAY better, still not perfect, but it was super rich and still breaking up under boost. My next idea is to send the injectors out to have them re-flowed, but theres only about 500 miles on them, and I pulled them out of the car today and they all look great. Also, I pulled the plugs out to see if I had a fouled cylinder, and all the plugs are clean as can be. I'm totally confused on this one! Any help would be super appreciated!
Thanks in advance
Thanks in advance
