rough running ls1 when cold

[pbl196]

Hi there my ls1 runs rough when cold but its fine when the engine is warm. Could the coolant temp sender be on its way out?

[PaulSV6]

Running rough has nothing to do with coolant temp sender
When was the last time ur car had a service? Could be ur injectors are clogged up, bad batch of fuel etc........

[Baldric]

replace yoru fuel filter next to the tank. and clean your filter, but ls1's are common to run a little rough when they could but once they heat up they seem to go ok

[pbl196]

Had the injectors cleaned only 10k ago and replaced the fuel filter at the same time, hopefully its only a bad batch of fuel. However when it runs rough when cold it also has a big flat spot down low once you get past that it drives ok.