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as for the throttle body the car will idle all day long it’s just comeing a stop it’s an nightmare have to step on the brake and gas to keep it running
Something definitely is wrong, that motor should be a monster. Hell my stock ls6 long block with full bolt ons is putting down 435+. My buddy has a heads cam 01 ss 346" stock short block, trick flow cnc 215s, 235/239 .630 .630 on a 110. He has 1 3/4" headers, catted y, magnaflow cat back, stock ls6 intake, stock maf, slp lid, paper filter, thermostat, no underdrive balancer, crap tune at the time and his car made 460 through a 6 speed & a 9". With a Ported FAST 102/102, electric water pump, FTP 104 lid, offroad y, cutout, underdrive balancer, and my tuning he will be over 500.
Maybe your guy went way conservative on the timing and or fat on the fuel. Or cam timing is off.
That was fixed, when I picked the car up the mechanic told me that the tuner took the car out and did sum street tuning , the only issue he told me was the stall converter was too small , for the cam that tsp speced,
Update on my car , sorry it took an year had to save some money up, well I didn’t install the cam motion cam , I went with an tick stage 2 blower cam 227/234 , the car ran really good n/a still made 448 wrhp but it was an blast to drive , I ended up buying an used D1sc ProCharger, and had the car returned yesterday made 602/504 at 8psi with 12 degrees of timing , on pump gas
Update on my car , sorry it took an year had to save some money up, well I didn’t install the cam motion cam , I went with an tick stage 2 blower cam 227/234 , the car ran really good n/a still made 448 wrhp but it was an blast to drive , I ended up buying an used D1sc ProCharger, and had the car returned yesterday made 602/504 at 8psi with 12 degrees of timing , on pump gas
The car idles fine in park it’s acts up when I’m driving slow coming to a red light Or stop sign
Of course it does. When there is no load on the engine it's going to idle higher. I'm not an engine expert either, but everything I'm reading suggests that the cam is too large for the RPM ranges you are operating at. When you are trying to build a car, part selection needs to be in line with your actual goals. This is why telling a speed shop you want 500HP N/A isn't necessarily the way to go. It's just a number. Albeit one you can use for bragging rights. The point is that if your at the track and can hit the target RPM ranges of a setup that needs to rev high, then that's not a problem.
For a street car, you don't want an engine that makes it's power at 7,000+ RPMs. An LSx engine isn't the same as some tiny high revving Honda engine. You want to make your power at lower RPM ranges. This is what will put that smile on your face from stop light to stop light.
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