# Electronic spark control engine miss **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [December 18, 2007, 1:39am UTC](https://community.cartalk.com/t/electronic-spark-control-engine-miss/8436 "2007-12-18T01:39:02Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![truckman101](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/truckman101/32/509_2.png) [@truckman101](https://community.cartalk.com/u/truckman101)\ **Post date:** [December 18, 2007, 1:39am UTC](https://community.cartalk.com/t/electronic-spark-control-engine-miss/8436/1 "2007-12-18T01:39:02Z")
I have a 1991 Chevrolet silverado with a 5.7 TBI 350 engine it has 130000 miles on it. Over the last week or so the truck has a lot of trouble starting. I have to crank it over several times and it barely fires. Once it is about running I can get it going be snapping the throttle just a little bit and it smoothes right out. The idling is good. The engine misses intermidintly when under a load getting off the gas when this happens seems to erase the problem and you can feel the engine have all kinds of power when I get on it. I got a service engine light that comes on shrtly after the engine is running or down the road. Having an adld connector ans obd1 system I retrieved my codes by jumping the adld terminal. I got a code 43 which is the electronic spark control module failure malfuction. I also checked the I ac unit and found a little carbon build up on the pintle. Adjusting the looseness and tightness of the iac made the engine respond at idle. I replaced it. I recently replaced the cap and rotor and about a year ago needed to replace the ignition module and coil. I seem to have good fuel pulse at all rpm ranges, but I cannot completely rule out fuel issues. Ran a fuel pressure check and got varying pressures. I know fuel pumps either work or don’t work, but if it was working half right like I heard. That can make the engine run ruff or die, but it would do that all the time wouldn’t it? Any help that can be given would be helpful and appreciated. ---
**Author:** ![edb1961](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/edb1961/32/122_2.png) [@edb1961](https://community.cartalk.com/u/edb1961)\ **Post date:** [December 18, 2007, 2:12am UTC](https://community.cartalk.com/t/electronic-spark-control-engine-miss/8436/2 "2007-12-18T02:12:22Z")
I’ve posted a few times to the Yahoo GM TBI group about my 93 305 TBI and they have been helpful. There’s not a lot of activity on the group at the moment, but you could search the message archive for similar problems. [http://autos.groups.yahoo.com/group/GM\_TBI/?yguid=288452351](http://autos.groups.yahoo.com/group/GM_TBI/?yguid=288452351) Ed B.